Ta có:

bbb : ab = a x b

=>bbb : b : ab = a

=>111 : ab = a

=>111 : 37 = 3

=>a=3;b=7

1/ was

2/all

3/such

4/to

5/who

6/have

7/handkerchief

8/you

9/for

10/your

1/by

2/to

3/been

4/his

5/have

6/it

7/the

8/was

9/did

10/back

1. was

2, married

3.ordered

4.chased

5.took

6.lived

7.loved

8.told

9.changed

10.made

11.went

12.put

13. found

14. were

1/If he gets up late, he will late....

2/ If Herry finishes the report, he will go out for a walk

4/ If I watch TV, I will feel relaxed

5/ If my sister has enough time, she won't cook me an......

6/ Unless he gets a visa, he can't travel around the world

7/ She has no money so she can't buy this computer

8/ We have a lot of money now because we have won the lottery

C1 : \(\frac{275}{100}\)= 1 + \(\frac{9}{10}\)+ \(\frac{85}{100}\)

C2 : \(\frac{275}{100}\)= 2 + \(\frac{7}{10}\)+ \(\frac{5}{100}\)

99-97+95-93+91-89+...+7-5+3-1

Số các số hạng là:

(99-1):2+1=50 số

=(99-97)+(95-93)+(91-89)+...+(7-5)+(3-1)

Số cặp sẽ là:

50:2=25 cặp

=2+2+2+...+2+2

=2x25

=50

32x47+32-53+168+79+132

=1504+32-53+(168+79+132)

=1536-53+379

=1483+379

=1862

25/2+25/3-25/7/1/3+1/3-1/7

\(=\frac{25}{2}+\frac{25}{3}-\frac{25}{7}:\frac{1}{3}+\frac{1}{3}-\frac{1}{7}\)

\(=\frac{25}{2}+\frac{25}{3}-\frac{25}{7}\times\frac{3}{1}+\frac{1}{3}-\frac{1}{7}\)

\(=\frac{25}{2}+\frac{25}{3}-\frac{156}{7}+\frac{1}{3}-\frac{1}{7}\)

\(=\frac{525}{42}+\frac{350}{42}-\frac{936}{42}+\frac{14}{42}-\frac{6}{42}\)

\(=\frac{875}{42}-\frac{936}{42}+\frac{14}{42}-\frac{6}{42}\)

\(=\frac{-61}{42}+\frac{14}{42}-\frac{6}{42}\)

\(=\frac{-47}{42}-\frac{6}{42}\)

\(=\frac{-53}{42}\)

( Chú Ý: lớp 5 chưa học số âm )