把(x-1)看作一个整体,合并3(x-1)的二次方

把(x-1)看作一个整体,合并3(x-1)的二次方-2(x-1)的三次方-5(1-x)的二次方+4(1-x)的三次方的结

1个回答

3(x-1)^2-2(x-1)^3-5(1-x)^2+4(1-x)^3
=3(x-1)^2-2(x-1)^3+5(x-1)^2-4(x-1)^3
=8(x-1)^2-6(x-1)^3