已知x+y=-6,x-y=5,求x^2-y^2
问题描述:
已知x+y=-6,x-y=5,求x^2-y^2
答
x²-y²
=(x+y)(x-y)
=(-6)(5)
=-30
已知x+y=-6,x-y=5,求x^2-y^2
x²-y²
=(x+y)(x-y)
=(-6)(5)
=-30