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a+a=a2 (3a)2=6a2 (a+1)2=a2+1 a•a=a2
-[+(-7)]=-7 +[-(+7)]=7 -[-(+7)]=7 -[-(-7)]=7
2x+3y=5xy x6÷x2=x3 x2·x3=x5 (-x3)3=x6
m÷n·m=m n÷m·m=n
3x+5y=8xy x3•x5=x8 x6÷x3=x2 (﹣x3)3=x6
2a+3b=5ab 7ab-3ab=4
a+a=a2 (3a)2=6a2 (a+1)2=a2+1 a ·a=a2
5a+3a=8a2 (a-b)2=a2-b2 a3•a7=a10 (a3)2=a7
(﹣5+a)(﹣5﹣a) (a﹣b)(a+c) (a+b)(﹣a﹣b) (x+1)(2﹣x)
﹣(﹣42)=﹣16 ﹣8﹣2×6=20 4=4 (﹣1)2013+(﹣1)2014=0