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2a2+3a2=5a2 2a2+3a2=6a2 4xy﹣3xy=1 2x3+3x3=5x6
2a2+3a2=5a2 2a2+3a2=6a2 4xy-3xy=1 2x3+3x3=5x6
﹣3a+4a=﹣7a 4m+2n=6mn 5x+4x=20x2 6xy3﹣2xy3=4xy3
xy2与﹣2x2y 3x2y与﹣4x2yz a3与b3 ﹣2a3b与2ba3
19a2b﹣9ab2=10ab 3x+3y=6xy 16y2﹣9y2=7 3x﹣4x+5x=4x
3x2y•5xy2=-2x2y -2x2y3•2xy=-2x3y4 28x4y2÷7x3y=4xy (-3a-2)(3a+2)=9a2-4
3a2+a2=3a4 8xy﹣7xy=xy 3x2y﹣xy2=2x2y 3a+b=3ab
(-2)0=1 28x4y2÷7x3=4xy2 (4xy2-6x2y+2xy)÷2xy=2y-3x (a-5)(a+3)=a2-2a-15
3x2y与-3xy2 3xy与-2yx 2x与2x2 5xy与5yz
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