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-xy与-yx -2与π 4x²y与-2xy² 5m²n与-3nm²
4m﹣m=3 2a3﹣3a3=﹣a3 a2b﹣ab2=0 yx﹣2xy=xy
﹣3a+4a=﹣7a 4m+2n=6mn 5x+4x=20x2 6xy3﹣2xy3=4xy3
3a2b与﹣2ba2 2xy与yx 16与﹣ ﹣2xy2与3yx2
3x2y与3xy2 2abc与-3ac 2xy与2ab -2xy与3yx
4x+3y=7xy 3a2﹣2a2=1 3x2y﹣3yx2=0 2a3+4a3=6a6
2x+2y=2xy (x2y3)2=x4y5 (xy)2÷=(xy)3 2xy﹣3yx=xy
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
4x﹣9x+6x=﹣x xy﹣2xy=3xy x3﹣x2=x
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