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x+y+z=0求证：(x^2-y^2)+(xz-yz)=0
题目详情
x+y+z=0 求证：(x^2-y^2)+(xz-yz)=0
▼优质解答
答案和解析
(x^2-y^2)+(xz-yz)
=(x-y)(x+y)+z(x-y)
=(x-y)(x+y+z)
=0
=(x-y)(x+y)+z(x-y)
=(x-y)(x+y+z)
=0
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