已知x+y=-6,x-y=5,求x^2-y^2
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已知x+y=-6,x-y=5,求x^2-y^2
已知x+y=-6,x-y=5,求x^2-y^2
已知x+y=-6,x-y=5,求x^2-y^2
x²-y²
=(x+y)(x-y)
=(-6)(5)
=-30
已知x+y=-6,x-y=5,
求x^2-y^2
=(x+y)(x-y)
=-6*5
=-30
335+786+545
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