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5a+2a=7a2 5a﹣2b=3ab 5a﹣2a=3 ﹣ab3+2ab3=ab3
5x+3x=8 2x+3y=5xy 3ab﹣ab=2ab ﹣(a﹣b)=﹣a﹣b
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
a+2a2=3a3 (a+b)2=a2+ab+b2 2(a﹣b)=2a﹣2b (2ab)2÷(ab)=2ab(ab≠0)
6a+a=7a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
2+a=2a 2a﹣3a=﹣1 (﹣a)2•a3=a5 8ab÷4ab=2ab
4a﹣9a+6a=﹣a 2ab﹣2ab=0 a3﹣a2=a ab﹣2ab=3ab