计算1/x-1/x-4
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计算1/x-1/x-4计算1/x-1/x-4计算1/x-1/x-41/x-1/(x-4)=(x-4-x)/x(x-4)=4/x(4-x)
计算1/x-1/x-4
计算1/x-1/x-4
计算1/x-1/x-4
1/x -1/(x-4)
=(x-4-x)/x(x-4)
=4/x(4-x)
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