=362x(178-78)

=362x100

=362000

362 x 178 - 362 x 78 = ( 178 - 78 ) x 362

                               = 100 x 362

                               = 36200

NHO H CHO MINH NHE

362 x 178 - 362 x 78 = 

362 x (178 - 78 )=

362 x 100 = 

36200

kick mik nha bạn

1 A

2 D

3 B

4 D

5 A

6 D

7 C

8 A

9 C

10 B

11 D

IV

12 went

13 is playing

14 closing

15 don't drink

16 would visit

17 B

18 D

19 B

20 D

21 cook

22 it

23 his

24 On

25 him

26 because

27 B

28 D

29 C

30 B

31 A

VIII

1 Janet isn't interested in watching sports on TV

2 I Think you should go to school by bike

3 Lake Baikal is the deepest lake in the world

4 He doesn't have enough time to complete the test

5 The last time he visited HLB is 5 years ago

IX 

37 In dry season there is alway a lack of water

38 Yesterday he was so tired that he didn't finish his work

39 There are 10 fingers and two arms on the body

40 What kind of TV programme do you like to watch the most when you were small?

I

1.What type of energy do you use at home?
2.John uses low energy light bulbs to save electricity.
3.Mai can't go to the cinema at present because she is studying for her exam.
4.What book are you currently reading?
5.She is not swimming in the swimming pool at the moment.
6.Scientists are looking for a new energy source to replace coal now

II.

1. Coal is more expensive and more polluting than natural gas.

2. We are looking for cheap and clean and effective sourced of energy..

3.. You should switch off electrical appliances when they aren’t in use.

4. Despite being the most polluting of fossil fuels, coal is still the largest sources of energy worldwide.

5. People will use biogas for fuel in homes and for transport

=23

\(=11.\left(23+77\right)\)

\(=11.100\)

\(=1100\)

23

\(3x+2.\left(x-3\right)-x=2010\)

\(\Leftrightarrow3x+2x-6-x=2010\)

\(\Leftrightarrow4x-6=2010\)

\(\Leftrightarrow4x=2016\)

\(\Leftrightarrow x=504\)

Vậy...

\(3\times+2\left(\times-3\right)-\times=2010\)

\(\Rightarrow2\times+2\times-6=2010\)

\(\Rightarrow4\times-6=2010\)

\(\Rightarrow4\times=2016\)

\(\Rightarrow\times=504\)

sợ đáp án sai quá mn

a, 0

b,0

c, 0

mình ko chắc lắm

a/ (x+y)(x+y)

   =x+y.x+y

   =x+x.y+y

   =2.x.2.y

    =2.(x+y)