Question

先化简后求值 x的3次方(-y的3次方)的二次方+(-1/2*xy的2次方)的3次方,其中x= -1/2,y=-根号2

Answer 1

x^3(-y^3)^2+(-1/2xy^2)^3

=x^3y^6-1/8*x^3y^6

=7x^3y^6/8