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a+a=a2 3a2﹣2a3=1 3a3﹣2a2=a ﹣a2+2a2=a2
a2+a2=2a4 2a2×a3=2a6 3a﹣2a=1 (a2)3=a6
a4+a5=a9 (2a2b3)2=4a4b6 ﹣2a(a+3)=﹣2a2+6a (2a﹣b)2=4a2﹣b2
3a·2a=5a 3a·2a=5a2 3a·2a=6a 3a·2a=6a2
2a2+3a2=5a4 5a2-2a2=3 a3×2a2=2a6 3a6÷a2=3a4
a+a=a2 a2·a2=2a2 (-ab)2=-2a2b2 (2a)2÷a=4a
﹣2(a+b)=﹣2a+b ﹣2(a+b)=﹣2a﹣b2 ﹣2(a+b)=﹣2a﹣2b ﹣2(a+b)=﹣2a+2b
a+2a=3a2 a•a2=a3 (2a)2=2a2 (﹣a2)3=a6
3a2﹣6a2=﹣3 (﹣2a)•(﹣a)=2a2 10a10÷2a2=5a5 ﹣(a3)2=a6