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(ab)2=ab2 3a+2a2=5a2 2(a+b)=2a+b a·a=a2
3a+2a=5a2 3a﹣a=2 2a3+3a2=5a5 ﹣a2b+2a2b=a2b
3a-2a=1 3a2+5a2=8a4 a2b-2ab2=-ab2 3a+2a=5a
,则A.=( ) A.30ab 60ab 15ab 12ab
3a+2a=5a2 3a﹣a=3 2a3+3a2=5a5 ﹣a2b+2a2b=a2b
3a·2a=5a 3a·2a=5a2 3a·2a=6a 3a·2a=6a2
3a2﹣a2=3 (a2)3=a5 a3•a6=a9 (2a2)2=4a2
3a+b=3ab 3a﹣a=2 2a3+3a2=5a5 ﹣a2b+2a2b=a2b
2a+3b=5ab 3a2+2a3=5a5 6ab﹣ab=5ab 5+a=5a
2a+3a=5a2 3ab﹣ab=2ab
2(a2+2b)=2a2+2b 5ab﹣b=5a