5(x-y)^3*[-6/25(y-x)^3][-2/3(y-x^4]=
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5(x-y)^3*[-6/25(y-x)^3][-2/3(y-x^4]=
5(x-y)^3*[-6/25(y-x)^3][-2/3(y-x^4]=
5(x-y)^3*[-6/25(y-x)^3][-2/3(y-x^4]=
5(x-y)^3*[-6/25(y-x)^3][-2/3(y-x)^4]
= 5(x-y)^3*[4/25(y-x)^7]
=(x-y)^3*{2/5[-(x-y)]^7}
=-2/5(x-y)^10
原式=5(Y-X)^3*(-6/25)(y-x)^3*(-2/3)(y-x)^4=4/5(y-x)^10