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The seventh grade mathematics exercise book (Qingdao edition) kneels for the answer on pages 43~45. Some of them are very grateful. Remember to hurry.
43. 1.( 1)(5a2)-b

(2)(x-y)3+3xy

(3)-x2-( 1/y)2

(4)-( 1/x).y)

2.a is the sum of 1 divided by 2 times of B.

The sum of the squares of a plus b

3. 13

4.4m+3.6n/m+n

leave out

6.a(m-c- 1)+b

n- 1

7.4.8+3.2

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