Question

问一道六升初一的数学题

36mn²（y-x）+27n³（x-y）+12m²
打错了，应该是36mn²（y-x）+27n³（x-y）+12m² n（x-y）

Answer 1

是因式分解吧。
3n(4m²-12mn+9n²)（x-y）
=3n（x-y）（2m-3n）²

Answer 2

36mn²（y-x）+27n³（x-y）+12m² n（x-y）
=(y-x)(36mn^2-27n^3-12m^2n)
=3n(y-x)(12mn-9n^2-4m^2)
=3n(x-y)(2m-3n)^2

Answer 3

36mn²（y-x）+27n³（x-y）+12m² n（x-y）
=n²[27n(x-y)-36m(x-y)]+12m² n（x-y）
=n[27n²(x-y)-36mn(x-y)+12m²(x-y)]
=3n(x-y)(9n²-12mn+4m²)
=3n(x-y)(3n-2mm)²

Answer 4

题目的要求是什么 3n(x-y)(2m-3n)*2