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a>ab>ab2 ab2>ab>a ab>a>ab2 ab>ab2>a
a>ab>ab2 ab2>ab>a ab>a>ab2 ab>ab2>a
AB=AC AB=2AC AB＞2AC AB＜2AC
a+2a2=3a3 （a+b）2=a2+ab+b2 2（a﹣b）=2a﹣2b （2ab）2÷（ab）=2ab（ab≠0）
，则A.的值为( ). A.2ab －ab 4ab －4ab
ab+2ab=3ab 2ab﹣ab=ab ab×2ab=2ab 
2+a=2a 2a﹣3a=1 3a+2b=5ab 5ab﹣ab=4ab
a＞ab＞ab2 ab＞ab2＞a ab＞a＞ab2 ab＜a＜ab2
a>ab>ab2 ab2>ab>a ab>a>ab2 ab>ab2>a
ab+2ab=3ab 2ab﹣ab=ab ab×2ab=2ab 
(AB/2)^(1/2) (2/AB)^(1/2) (AB/2) ² (2/AB) ²
a2-2ab a2-2ab-3b2 a2-2ab+b2 a2-2ab+2b2
S=2AB/（A+ S=（A+/AB S=AB/2（A+ S=AB/（A+ S=2（A+/AB
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