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a3•a4=a12 20020+(﹣1)2002=2
a+a=a2 (3a)2=6a2 (a+1)2=a2+1 a•a=a2
x6÷x3=x2B (x-1)2=x2-1 x4+x4=x8 (x-1)2=x2-2x+1
m÷n·m=m n÷m·m=n
3x+2y= 5xy -y2-y2=0 7x+7x=14x2 7x-7x=0
2a+3b=5ab 7ab-3ab=4
a+a=a2 (3a)2=6a2 (a+1)2=a2+1 a ·a=a2
a+a=a2 a2·a2=2a2 (-ab)2=-2a2b2 (2a)2÷a=4a
5a+3a=8a2 (a-b)2=a2-b2 a3•a7=a10 (a3)2=a7
(a+b)2=a2+b2 a•a2=a3 a8÷a2=a4 a2+a3=a5
﹣(﹣42)=﹣16 ﹣8﹣2×6=20 4=4 (﹣1)2013+(﹣1)2014=0