合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4

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合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4

合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4
合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4
合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4

合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4
原式=3(x-y)^4-[-3(x-y)^4]-(x-y)^4
=3(x-y)^4+3(x-y)^4-(x-y)^4
=5(x-y)^4

(x-y)^4+4(X-Y)^4