关于初二的几道分式题,
问题描述：
关于初二的几道分式题,
①.x^+xy/x^-xy ÷ (x+y) ÷ xy/y^-xy
②.（2a^y/-x）的三次方
③.（-a的三次方/-2b）÷ (-a^/-b)的三次方 · (b/2)^
④.（x的三次方y/z）^ · xz/y · (yz/x^)的三次方
答
①.x^+xy/x^-xy ÷ (x+y) ÷ xy/y^-xy
=[x(x+y)/x(x-y)]÷(x+y)÷[-xy/y(x-y)]
=[1/(x-y)]×[-(x-y)/x]
=-1/x
②.（2a^y/-x）的三次方
=-8a^6y^3/x^3
③.（-a的三次方/-2b）÷ (-a^/-b)的三次方 · (b/2)^
=(a³/2b)×(b³/a^6)×(b^/4)
=1/(8a³)
④.（x的三次方y/z）^ · xz/y · (yz/x^)的三次方
=(x^6y^/z^)×(xz/y)×(y³z³/x^6)
=x^6y^×xz×y³z³/(z^×y×x^6)
=xy^4z²