计算[(y-x)^4](x-y)^3+[(y-x)^3](x-y)
2个回答
[(y-x)^4](x-y)^3+[(y-x)^3](x-y)
=(x-y)^4×(x-y)^3-(x-y)^3(x-y)
=(x-y)^7-(x-y)^4
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