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数学
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八年级分解因数数学题
x+y=20xy=75求x^2+y^2的值
人气:337 ℃ 时间:2020-03-29 11:37:16
解答
(a+y)^2=20^2
x^2+2xy+y^2=400
x^2+y^2=400-2xy=400-150=250
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