计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x

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计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x

计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x
计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x

计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x
1.[(a+b)^2-(a+b)(a-b)]÷(-b)
=[(a+b)(a+b-a+b)]÷(-b)
=[(a+b)(2b)]÷(-b)
=-2(a+b)
或者:=-2a-2b
2.[(x+y)(2x+y)+(x+y)(x-y)]÷(3x)
=[(x+y)(2x+y+x-y)]÷(3x)
=[(x+y)*3x]÷(3x)
=x+y

1、-2a-2b
2、x+y