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5m2﹣3m2=2 2x+3x=5x2 2a+3b=5ab 7xy﹣6xy=xy
（﹣2a2b3）÷（﹣2ab）=a2b2 （3x2y﹣6xy）÷6xy=0.5x （21x5y2﹣9x4y3）÷3x3y2=7x2﹣3xy （3x2y+xy）÷xy=3x
4m﹣m=3 2a3﹣3a3=﹣a3 a2b﹣ab2=0 yx﹣2xy=xy
a2+2a3=3a5 (2b2)3=6b5 (3xy)2÷(xy)=3xy 2x·3x5=6x6
4m﹣m=3 a2b﹣ab2=0 2a3﹣3a3=a3 xy﹣2xy=﹣xy
﹣3a+4a=﹣7a 4m+2n=6mn 5x+4x=20x2 6xy3﹣2xy3=4xy3
4xy+xy=5xy x+2x=2x² 5xy-3xy=2 x+y=xy
12xy-4x 12xy-10x 12xy-8x 12xy-2x
3m﹣m=2 a2b﹣ab2=0 xy﹣2xy=﹣xy 2x+2y=5xy
3m﹣m=2 a2b﹣ab2=0 2x+3y=5xy xy﹣2xy=﹣xy
3a2+a2=3a4 8xy﹣7xy=xy 3x2y﹣xy2=2x2y 3a+b=3ab
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－2)0＝1 28x4y2÷7x3＝4xy2 (4xy2－6x2y＋2xy)÷2xy＝2y－3x (a－5)(a＋3)＝a2－2a－15
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