若a-b=3ab,则2a-ab-2b/a+2ab-b=?
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若a-b=3ab,则2a-ab-2b/a+2ab-b=?若a-b=3ab,则2a-ab-2b/a+2ab-b=?若a-b=3ab,则2a-ab-2b/a+2ab-b=?(2a-ab-2b)/(a+2a
若a-b=3ab,则2a-ab-2b/a+2ab-b=?
若a-b=3ab,则2a-ab-2b/a+2ab-b=?
若a-b=3ab,则2a-ab-2b/a+2ab-b=?
(2a-ab-2b)/(a+2ab-b)
=(2(a-b)-ab)/(a-b+2ab)
=(2*3ab-ab)/(3ab+2ab)
=5ab/5ab
=1
a=b/(1-3b)
假设b=1,a=-1/2;满足条件a-b=3ab;
套入公式:2a-ab-2b/a+2ab-b=3/2.
你自己再算一下,可能计算有失误,这种题还是设个数好算的多。既然满足条件,答案肯定是对的。
a-b=3ab
(2a-ab-2b)/(a+2ab-b)
=[2(a-b)-ab]/(a-b+2ab)
=(2*3ab-ab)/(3ab+2ab)
=5ab/5ab
=1
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若a-b=3ab,则2a-ab-2b/a+2ab-b=?
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a-b=3ab,则代数式2a-2b-ab/a-b+2ab的值是()