Question

下列各式中不能成立的是A.(3a-b)^2=9a^2-6ab+b^2 B.(2/1x+y)^2=4/1x^2+xy+y^

Answer 1

D.(x+y)(x-y)(x^2-Y^2)=x^4-y^4

应该是(x^2-Y^2)^2