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
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
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