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5a+2a=7a2 5a﹣2b=3ab 5a﹣2a=3 ﹣ab3+2ab3=ab3
3a2·(-2a3)=6a6 a(a2-1)=a3-1 (a+b)(a-2b)=a2-ab-2b2 -2a·(a2)3=-2a9
a+a=2a2 a2·a=2a2 (-ab)2=2ab2 (2a)2 ÷a=4a
a+2a2=3a3 (a+b)2=a2+ab+b2 2(a﹣b)=2a﹣2b (2ab)2÷(ab)=2ab(ab≠0)
a+a=2a2 a5﹣a2=a3 3a+b=3ab a2﹣3a2=﹣2a2
5a+2a=7a2 5a﹣2a=3 5a﹣2a=3a ﹣ab+2ab2=ab2
2a•3b=5ab a3•a4=a12 (﹣3a2b)2=6a4b2 a5÷a3+a2=2a2
a+a=a2 a2·a2=2a2 (-ab)2=-2a2b2 (2a)2÷a=4a
2ab2 -3a2 ab
(2ab)2=2a2b2 (a+b)2=a2+b2 a5+b5=2a10 (a2+a)÷a=a+1
S(AB)<S(A2B) S(AB)>S(A2B) S(AB)=S(A2B) 不能确定