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a+a2=2a3 a2•a3=a6 (2a4)4=16a8 (-a)6÷a3=a3
,则A.=( ) A.30ab 60ab 15ab 12ab
A3=Ac3=Ar3 Ac3>A3>Ar3 Ac3
2a•3b=5ab a3•a4=a12 (﹣3a2b)2=6a4b2 a5÷a3+a2=2a2
5a2b﹣4a2b=a2b 2b2+3b3=5b5 6a3﹣2a3=4 a+b=ab
3a>3b -3a>-3b a-3>b-3 >
(a﹣b)2=a2﹣b2 (﹣a4)3=a7 2a•(﹣3b)=6ab a5÷a4=a(a≠0)
=Al+A3 =MAX(A1:A3) =SUM(A1:A3) =MIN(A1:A3)
2/3ab一6b+18n 1/3ab-6b (1/3b一a)×18 1/3ab一(1/3b—n)×18
=A1+A2+A3/3 =SUM(A1:A3)/3 =AVERAGE(A1:A3) =AVERAGE(A1:A2:A3)