已知x+y=6,x-y=5,则x^2-y^2等于多少
问题描述:
已知x+y=6,x-y=5,则x^2-y^2等于多少
答
x^2-y^2
=(x-y)(x+y)
=5×6
=30
已知x+y=6,x-y=5,则x^2-y^2等于多少
x^2-y^2
=(x-y)(x+y)
=5×6
=30