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2a•3a=6a (﹣a3)2=a6 6a÷2a=3a (﹣2a)3=﹣6a3
3a﹣2a=a 2a•3a=6a a2•a3=a6 (3a)2=6a2
2x+3y=5xy -2ba2+a2b=-a2b 2a2+2a3=2a5 4a2-3a2=1
a1+a2,a2+a3,a3-a1 a1+a2,a2+a3,a1+2a2+a3 a1+a2,2a2+3a3,3a3+a1 a1+a2+a3,2a1-3a2+22a2,3a 1+5a2-5a3
2a•3b=5ab a3•a4=a12 (﹣3a2b)2=6a4b2 a5÷a3+a2=2a2
2a2+3a2=5a4 5a2-2a2=3 a3×2a2=2a6 3a6÷a2=3a4
a+2a=3a2 a•a2=a3 (2a)2=2a2 (﹣a2)3=a6
2x+3y=5xy 2a2+2a3=2a5 4a2﹣3a2=1 ﹣2ba2+a2b=﹣a2b