若(x-y)乘(x+y)=5,(x+y)^2=4,试求x-y的值
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若(x-y)乘(x+y)=5,(x+y)^2=4,试求x-y的值若(x-y)乘(x+y)=5,(x+y)^2=4,试求x-y的值若(x-y)乘(x+y)=5,(x+y)^2=4,试求x-y的值(x+y
若(x-y)乘(x+y)=5,(x+y)^2=4,试求x-y的值
若(x-y)乘(x+y)=5,(x+y)^2=4,试求x-y的值
若(x-y)乘(x+y)=5,(x+y)^2=4,试求x-y的值
(x+y)^2=4,
x+y=±2
x-y=5/(x+y)=±2.5
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(x+y)^2=4
x+y=2,-2
x-y=5/2,-5/2
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