[5xy/(x³-x²y)]⁴÷(-5/x²y)⁴*[(y-x)/xy]³=[5xy/x²(x-y)]⁴*(x²y/5)⁴*[(y-x)/xy]³=[5xy/x²(x-y)*(x²y/5)]⁴*[(y-x)/xy]³=[xy²/...