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5x+3x2=8x3 2a2b-a2b=1 -ab-ab=0 -y2x+xy2=0
2a2+3a2=5a2 2a2+3a2=6a2 4xy﹣3xy=1 2x3+3x3=5x6
2a2+3a2=5a2 2a2+3a2=6a2 4xy-3xy=1 2x3+3x3=5x6
3x+y=4xy 2x2+3x2=5x4 6x2﹣3x2=3 5xy﹣3xy=2xy
3x+2x2=5x3 2a2b-a2b=1 -ab-ab=0 -xy2+xy2=0
3x+5y=8xy 3y2-y2=3 15ab-15ba=0 7x3-6x2=x
)2a+4a=8a2 ( )3x+2y=5xy ( )7x2-3x2=4 ( )9a2b-9ba2=0
5xy﹣xy=5 m+m=m2 ﹣y﹣y=0 ﹣2xy+2xy=0
3a+2b=5ab 3x+2x=6x -a-a=-2a -3xy+3xy=xy
5x+5y=10xy 7x-(-2)x=5x -3x-2x=x 6x-3x=3x
2a+4a=8a2 3x+2y=5xy 7x2﹣3x2=4 9a2b﹣9ba2=0
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