Question

1:计算2(a+b)^2/(a+b)-3(a+b)/(a+b).

Answer 1

1.2(a+b)^2/(a+b)-3(a+b)/(a+b)=2(a+b)-3=2a+2b-3

2:(12x^4 y^3-16x^3y^2+3x^2 y)/(-4x^2 y)=-3x^2y^2+4xy+3/4

3.【（2x-1）的平方-1】除以（-2x）=(4x^2-4x)/(-2x)=-2x+2