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(2006•平凉)下列运算中,不正确的是A.ab+2ab=3abB.2ab-ab=abC....
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(2006•平凉)下列运算中,不正确的是( )
A.ab+2ab=3ab
B.2ab-ab=ab
C.ab×2ab=2ab
D.
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(2006•平凉)下列运算中,不正确的是( )
A.ab+2ab=3ab
B.2ab-ab=ab
C.ab×2ab=2ab
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A.ab+2ab=3ab
B.2ab-ab=ab
C.ab×2ab=2ab
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