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x^2-y^2=(x+4)(7-y),则x^y-2=
人气:171 ℃ 时间:2020-09-16 09:59:30
解答
x^2-y^2
=(x+y)(x-y)=(x+4)(7-y)所以y=4 x=7于是x^y-2=7^2=49
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