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2a•3a=6a (﹣a3)2=a6 6a÷2a=3a (﹣2a)3=﹣6a3
a+a=2a2 a5﹣a2=a3 3a+b=3ab a2﹣3a2=﹣2a2
3a﹣2a=a 2a•3a=6a a2•a3=a6 (3a)2=6a2
2a2+3a2=5a4 5a2-2a2=3 a3×2a2=2a6 3a6÷a2=3a4
a+2a=3a2 a•a2=a3 (2a)2=2a2 (﹣a2)3=a6
a2·a2=2a4 (-a2)3=-a6 3a2-6a2=3a2 (a-2)2=a2-4
2a•3a=6a (3a2)3=27a6 a4÷a2=2a (a+b)2=a2+ab+b2