Question

{2x的平方-（x+y）（x-y）｝｛（-x-y）（y-x）+2y的平方｝x=根号2,y=根号3

Answer 1

=(2x^2-(x^2-y^2))*(2y^2+(x^2-y^2))

=(x^2+y^2)^2

=(2+3)^2=25