帮下忙,[x]

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帮下忙,[x]
帮下忙,[x]

帮下忙,[x]
先不妨设x>y.(因为外面都有绝对值,所以x,y地位平等,所以可以这样设）.
那么|x-y/1-xy |-1 = (x-y-1+xy)/(1-xy) = (x-1)(1-y)/(1-xy)

帮下忙,[x] (7x+3x^2)除以(2x+1)*(6x+3)除以(7x+3) 帮下忙 x x X x x x x x x x x |x| X x x X