已知:X-Y\X+Y=4,求X-Y\2(X+Y)-4X+4Y\X-Y的值
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已知:X-Y\X+Y=4,求X-Y\2(X+Y)-4X+4Y\X-Y的值已知:X-Y\X+Y=4,求X-Y\2(X+Y)-4X+4Y\X-Y的值已知:X-Y\X+Y=4,求X-Y\2(X+Y)-4X+
已知:X-Y\X+Y=4,求X-Y\2(X+Y)-4X+4Y\X-Y的值
已知:X-Y\X+Y=4,求X-Y\2(X+Y)-4X+4Y\X-Y的值
已知:X-Y\X+Y=4,求X-Y\2(X+Y)-4X+4Y\X-Y的值
(x-y)/(x+y)=4
所以(x+y)/(x-y)=1/4
(x-y)/[2(x+y)]-(4x+4y)/(x-y)
=(1/2)*[(x-y)/(x+y)]-4[(x+y)/(x-y)]
=(1/2)*4-4*(1/4)
=1
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