(x/y)^2乘以(xy)^-2除以(x^-1y)
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(x/y)^2乘以(xy)^-2除以(x^-1y)(x/y)^2乘以(xy)^-2除以(x^-1y)(x/y)^2乘以(xy)^-2除以(x^-1y)原式=x^2*1/y^2*1/x^2y^2÷y/x
(x/y)^2乘以(xy)^-2除以(x^-1y)
(x/y)^2乘以(xy)^-2除以(x^-1y)
(x/y)^2乘以(xy)^-2除以(x^-1y)
原式=x^2*1/y^2*1/x^2y^2÷y/x
=x/y^5