1.  Beside the roadside__________.

            A. a horse stood                                           B. does a horse stand

            C. did a horse stand   D. stood a horse

2.  Only after they send you an application ________.

            A. can you apply        B. you can apply       C. do you apply            D. did you apply

3.  At no time ______ greater opportunities.

            A. did women had     B. has women had     C. does women have    D. have women had

4.  Not once ______ into her eyes.

            A. he looked              B. does he looked     C. did he look              D. looked he

5.  On no account ______in the office be used for personal materials.

            A. the photocopy machines                         B. should the photocopy machines

            C. the photocopy machines should              D. does the photocopy machines

6.  Rarely _______ permission to return to homes contaminated during a toxic waste accident.

            A. is people given      B. do people given    C. people given            D. are people given

7.  In front of the gate ______ the guard.

            A. did                        B. does                      C. did stand                 D. stood

8.  Only on rare occasions _______ to the theatre.

            A. do they go             B. they went              C. go they                     D. went they

9.  Only once a day ______ home.

            A. does Mary leave                                      B. left Mary

            C. Mary leaves                                             D. will Mary left

10.      On the island _______ the only presentation of the Indian’ handicraft.

            A. remains                  B. does it remain       C. did it remain            D. remain it

11.      _______ an emergency arise, call 911.

            A. Can                       B. Does                     C. Should                     D. Will

12.      _______ has the work been so easy.

            A. Never                    B. Only by                 C. when                        D. For

13.      Little ______ what is in store for him.

            A. he knows               B. does he know       C. knows he                 D. knew he

14.      _______ the reservoir, the ancient village couldn’t have been discovered.

            A. Had the drought not lowered                 B. If had the drought not lowered

            C. The drought had not lowered                 D. Not had the drought lowered

15.      Up ______ when it saw its master.

            A. jumped the dog                                       B. did the dog jump

            C. the dog jumped                                       D. does the dog jump

16.      ______ have playing cards been used for card games but also for fortune- telling.

            A. Not as much          B. Not only               C. But also                   D. Never

17.      ______ he driving too fast, but recklessly as well.

            A. Not only was        B. Neither was          C. Was not only           D. Was either 

18.      Only once ______ late to school.

            A. he came                 B. did he came          C. came he                    D. did he come

19.      Such ______ that he would stop at nothing.

            A. his ambition was   B. did his ambition

            C. does his ambition D. was his ambition 

20.      Scarcely _______ the expense of new equipment ______ problem.

            A. should / considered                                 B. did / be considered

            C. should / be considered                            D. was / be considered

21.      Down_____ for three days last week.

            A. the rain poured                                        B. did the rain pour

            C. poured the rain                                        D. do the rain pour

22.      ______ had the restaurant opened ______ people were flocking to eat there.

            A. hardly / than          B. no sooner / that     C. no sooner / than       D. hardly / that

23.      Under the tree ______ full of food.

            A. a basket was          B. was a basket         C. are a basket              D. were a basket  

1.  Beside the roadside__________.

            A. a horse stood                                           B. does a horse stand

            C. did a horse stand   D. stood a horse

2.  Only after they send you an application ________.

            A. can you apply        B. you can apply       C. do you apply            D. did you apply

3.  At no time ______ greater opportunities.

            A. did women had     B. has women had     C. does women have    D. have women had

4.  Not once ______ into her eyes.

            A. he looked              B. does he looked     C. did he look              D. looked he

5.  On no account ______in the office be used for personal materials.

            A. the photocopy machines                         B. should the photocopy machines

            C. the photocopy machines should              D. does the photocopy machines

6.  Rarely _______ permission to return to homes contaminated during a toxic waste accident.

            A. is people given      B. do people given    C. people given            D. are people given

7.  In front of the gate ______ the guard.

            A. did                        B. does                      C. did stand                 D. stood

8.  Only on rare occasions _______ to the theatre.

            A. do they go             B. they went              C. go they                     D. went they

9.  Only once a day ______ home.

            A. does Mary leave                                      B. left Mary

            C. Mary leaves                                             D. will Mary left

10.      On the island _______ the only presentation of the Indian’ handicraft.

            A. remains                  B. does it remain       C. did it remain            D. remain it

11.      _______ an emergency arise, call 911.

            A. Can                       B. Does                     C. Should                     D. Will

12.      _______ has the work been so easy.

            A. Never                    B. Only by                 C. when                        D. For

13.      Little ______ what is in store for him.

            A. he knows               B. does he know       C. knows he                 D. knew he

14.      _______ the reservoir, the ancient village couldn’t have been discovered.

            A. Had the drought not lowered                 B. If had the drought not lowered

            C. The drought had not lowered                 D. Not had the drought lowered

15.      Up ______ when it saw its master.

            A. jumped the dog                                       B. did the dog jump

            C. the dog jumped                                       D. does the dog jump

16.      ______ have playing cards been used for card games but also for fortune- telling.

            A. Not as much          B. Not only               C. But also                   D. Never

17.      ______ he driving too fast, but recklessly as well.

            A. Not only was        B. Neither was          C. Was not only           D. Was either 

18.      Only once ______ late to school.

            A. he came                 B. did he came          C. came he                    D. did he come

19.      Such ______ that he would stop at nothing.

            A. his ambition was   B. did his ambition

            C. does his ambition D. was his ambition 

20.      Scarcely _______ the expense of new equipment ______ problem.

            A. should / considered                                 B. did / be considered

            C. should / be considered                            D. was / be considered

21.      Down_____ for three days last week.

            A. the rain poured                                        B. did the rain pour

            C. poured the rain                                        D. do the rain pour

22.      ______ had the restaurant opened ______ people were flocking to eat there.

            A. hardly / than          B. no sooner / that     C. no sooner / than       D. hardly / that

23.      Under the tree ______ full of food.

            A. a basket was          B. was a basket         C. are a basket              D. were a basket  

\(\dfrac{21}{36}-\left(-\dfrac{11}{30}\right)=\dfrac{7}{12}+\dfrac{11}{30}=\dfrac{7.5+11.2}{60}=\dfrac{57}{60}=\dfrac{19}{20}\\ ----\\\dfrac{-4}{8}+\left(-\dfrac{3}{10}\right)=\dfrac{-1}{2}-\dfrac{3}{10}=\dfrac{-1.5-3}{10}=\dfrac{-8}{10}=-\dfrac{4}{5}\\ ----\\ \dfrac{7}{12}-\left(-\dfrac{9}{20}\right)=\dfrac{7}{12}+\dfrac{9}{20}=\dfrac{7.5+9.3}{60}=\dfrac{62}{60}=\dfrac{31}{30}\\ ---\\ \dfrac{-2}{5}+\left(-\dfrac{11}{30}\right)=-\dfrac{2}{5}-\dfrac{11}{30}=\dfrac{-2.6-11}{30}=-\dfrac{29}{30}\)

1.C

2.A

3.C

4.C

5.B

1. A. bed B. setting C. decide D. get

2. A. easy B. eat C. learn D. tea

3. A. sit B. in C. if D. fine

4. A. child B. watch C. chin D. school

5. A. come B. no C. open D. home

1 C

2 C

3 D

4 D

5 A

a) \(\dfrac{-5}{11}+\left(\dfrac{-6}{11}+1\right)\)

\(=\dfrac{-5}{11}+\left(\dfrac{-6}{11}+\dfrac{11}{11}\right)\)

\(=\dfrac{-5}{11}+\dfrac{5}{11}\)

\(=0\)

b) \(\dfrac{2}{3}+\left(\dfrac{5}{7}+\dfrac{-2}{3}\right)\)

\(=\dfrac{2}{3}+\dfrac{-2}{3}+\dfrac{5}{7}\)

\(=0+\dfrac{5}{7}\)

\(=\dfrac{5}{7}\)

c) \(\left(\dfrac{-1}{4}+\dfrac{5}{8}\right)+\dfrac{-3}{8}\)

\(=\dfrac{-1}{4}+\dfrac{-3}{8}+\dfrac{5}{8}\)

\(=\dfrac{-2}{8}+\dfrac{-3}{8}+\dfrac{5}{8}\)

\(=0\)

d) \(\dfrac{3}{4}.\dfrac{7}{25}+\dfrac{3}{4}.\dfrac{18}{25}\)

\(=\dfrac{3}{4}.\left(\dfrac{7}{25}+\dfrac{18}{25}\right)\)

\(=\dfrac{3}{4}.1\)

\(=\dfrac{3}{4}\)

Chúc bạn học tốt

a) \(\dfrac{-15}{4}:\dfrac{21}{-10}=\dfrac{-15}{4}.\dfrac{-10}{21}=\dfrac{25}{14}\)

b) \(\dfrac{-7}{14}:\left(-0,14\right)=\dfrac{-7}{14}.\dfrac{-50}{7}=\dfrac{25}{7}\)

c) \(\left(\dfrac{-11}{15}\right):1\dfrac{1}{10}=\dfrac{-11}{15}.\dfrac{10}{11}=\dfrac{-2}{3}\)

d) \(2\dfrac{1}{7}:1\dfrac{1}{14}=\dfrac{15}{7}.\dfrac{14}{15}=2\)

\(a.-\dfrac{15}{4}:\left(\dfrac{21}{-10}\right)\)

\(=-\dfrac{15}{4}\cdot\left(-\dfrac{10}{21}\right)\)

\(=\dfrac{25}{14}\)

\(b.-\dfrac{7}{14}:\left(-0,14\right)\)

\(=-\dfrac{1}{2}:\left(-\dfrac{7}{50}\right)\)

\(=\dfrac{25}{7}\)

\(c.\left(-\dfrac{11}{15}\right):\left(1\dfrac{1}{10}\right)\)

\(=\left(-\dfrac{11}{15}\right):\dfrac{11}{10}\)

\(=-\dfrac{2}{3}\)

\(d.\left(2\dfrac{1}{7}\right):\left(1\dfrac{1}{14}\right)\)

\(=\dfrac{15}{7}:\dfrac{15}{14}\)

\(=2\)

a) \(\dfrac{-15}{4}:\dfrac{21}{-10}=\dfrac{-15}{4}.\dfrac{-10}{21}=\dfrac{25}{14}\)

b) \(\dfrac{-7}{14}:\left(-0,14\right)=\dfrac{-7}{14}:\dfrac{-7}{50}=\dfrac{-7}{14}.\dfrac{50}{-7}=\dfrac{25}{7}\)

c) \(\dfrac{-11}{15}:1.\dfrac{1}{10}=\dfrac{-11}{15}.\dfrac{1}{10}=\dfrac{-11}{150}\)

d) \(\dfrac{21}{7}:1.\dfrac{1}{14}=3.\dfrac{1}{14}=\dfrac{3}{14}\)

a(b-c)-a(b+d)=-a(c+d)

<=> ab-ac-ab-ad=-ac-ad

<=> (ab-ab)+-ac-ad=-ac-ad

<=> 0-ac-ad=-ac-ad

<=>-ac-ad=-ac-ad (đpcm)

a(b-c)-a(b+d)=-a(c+d)

Ta có : a(b-c)-a(b+d)

       = ab - ac - ab - ad

       = -ac - ad

       = -a( c + d ) \(\rightarrow\)ĐPCM

# HOK TỐT #

Ta có : 

a(b-c) - a(b+d) = a(b-c-b-d) = a(-c-d)=-a(c+d)