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4m﹣m=3 2a3﹣3a3=﹣a3 a2b﹣ab2=0 yx﹣2xy=xy
5x2y与xy ﹣5x2y与yx2 5ax2与yx2 83与x3
5x2y与 xy -5x2y与 yx2 5ax2与 yx2 83与x3
3x2y与﹣3xy2 3xy与﹣2yx 2x与2x2 5xy与5yz
7xy﹣7yx=0 ﹣5x3+2x3=﹣3 3x+4y=7xy 4x2y﹣4xy2=0
3a2b与﹣2ba2 2xy与yx 16与﹣ ﹣2xy2与3yx2
3x2y与3xy2 2abc与-3ac 2xy与2ab -2xy与3yx
(﹣1)2=2 ﹣|﹣2|=2 ﹣5a+8a=﹣3a ﹣2xy+3yx=xy
3xy与﹣2yx 3x2y与﹣3xy2 2x与2x2 5xy与5yz
2x+2y=2xy (x2y3)2=x4y5 (xy)2÷=(xy)3 2xy﹣3yx=xy
2x+2y=2xy (x2y3)2=x4y5 (xy)2÷=(xy)3 2xy﹣3yx=xy
3x2y与-3xy2 3xy与-2yx 2x与2x2 5xy与5yz
﹣xy+xy=0 4x﹣2x=2x 5x2y﹣6xy2=﹣1 2xy﹣yx=xy
3x2y与3xy2 2abc与-3ac 2xy与2ab 2xy与-yx
3xy与-2yz是同类项 5xy与6yx是同类项 2x与x2是同类项 2x2y与2xy2是同类项