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3x2y与3xy2 3xy与﹣2xy2 ﹣2xy2与﹣2ab2 0与π
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
3a+2b=5ab 3x+2x=6x -a-a=-2a -3xy+3xy=xy
3x2y与3xy2 abc与ac -2xy与-3ab xy与-xy
3x2y与3xy2 2abc与-3ac 2xy与2ab -2xy与3yx
3x2y与-3xy2 3xy与-2yx 2x与2x2 5xy与5yz
2a+4a=8a2 3x+2y=5xy 7x2﹣3x2=4 9a2b﹣9ba2=0
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