4Y(Y-X)^6分之2x(x-y)^7
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4Y(Y-X)^6分之2x(x-y)^7
4Y(Y-X)^6分之2x(x-y)^7
4Y(Y-X)^6分之2x(x-y)^7
4Y(Y-X)^6分之2x(x-y)^7
=4y(x-y)^6分之2x(x-y)^7
=x(x-y)/2y
即2y分之x(x-y)
4Y(Y-X)^6分之2x(x-y)^7
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