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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
2x+3y=5xy -2ba2+a2b=-a2b 2a2+2a3=2a5 4a2-3a2=1
2a2+3a2=5a4 5a2-2a2=3 a3×2a2=2a6 3a6÷a2=3a4
a+2a=3a2 3a-2a=a a•2a=3a2 2(a+1)=2a
a+2a=3a2 a•a2=a3 (2a)2=2a2 (﹣a2)3=a6
2a+3b=5ab; a3-a2=a; a2+2a2=3a2; (a-1)0=1.
2x+3y=5xy 2a2+2a3=2a5 4a2﹣3a2=1 ﹣2ba2+a2b=﹣a2b