把(X-Y)和(X+Y)各看作一个字母因式,合并同类项3(X+Y)²-(X-Y)+2(X+Y)²+(X-Y)-5(X-Y)²=2在后面是²,2在前面是与后面相乘.

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把(X-Y)和(X+Y)各看作一个字母因式,合并同类项3(X+Y)²-(X-Y)+2(X+Y)²+(X-Y)-5(X-Y)²=2在后面是²,2在前面是与后面相乘.
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把(X-Y)和(X+Y)各看作一个字母因式,合并同类项3(X+Y)²-(X-Y)+2(X+Y)²+(X-Y)-5(X-Y)²=2在后面是²,2在前面是与后面相乘.
把(X-Y)和(X+Y)各看作一个字母因式,合并同类项3(X+Y)²-(X-Y)+2(X+Y)²+(X-Y)-5(X-Y)²=
2在后面是²,2在前面是与后面相乘.

把(X-Y)和(X+Y)各看作一个字母因式,合并同类项3(X+Y)²-(X-Y)+2(X+Y)²+(X-Y)-5(X-Y)²=2在后面是²,2在前面是与后面相乘.
5(X+Y)²-5(X-Y)²