Question

化简整式-3中括号y-（3x²-3xy）中括号-中括号y+2（4x²-4xy）中括号3x²

Answer 1

1、-3[y-(3x^2-3xy) ]-[y+2(4x^2-4xy) ]=-3y+8x^2+9xy-y-8x^2+8xy=17xy-4y

2、3x^2 y-[2xy^2-4(1/2 xy-3/4 x^2 y)+xy]13xy^2==3x^2 y-[2xy^2-2xy+3x^2 y+xy]13xy^2=3x^2 y-26x^2 y^4+13x^2 y^3-39x^3 y^3

备注：第二题13xy²前面应该少了一个符号!您可以再追问~