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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
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
a2-2ab a2-2ab-3b2 a2-2ab+b2 a2-2ab+2b2