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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
3a2·(-2a3)=6a6 a(a2-1)=a3-1 (a+b)(a-2b)=a2-ab-2b2 -2a·(a2)3=-2a9
2x+3y=5xy -2ba2+a2b=-a2b 2a2+2a3=2a5 4a2-3a2=1
3a·2a=5a 3a·2a=5a2 3a·2a=6a 3a·2a=6a2
a5+a5=a10 a3÷a﹣1=a2 a•2a2=2a4 (﹣a2)3=﹣a6
a+a=a2 a2·a2=2a2 (-ab)2=-2a2b2 (2a)2÷a=4a
(2ab)2=2a2b2 (a+b)2=a2+b2 a5+b5=2a10 (a2+a)÷a=a+1
﹣40=1 2a(a+1)=2a2+2a (a+b)﹣1=a﹣1+b﹣1 (y﹣2x)(y+2x)=y2﹣2x2
2x+3y=5xy 2a2+2a3=2a5 4a2﹣3a2=1 ﹣2ba2+a2b=﹣a2b