把a+b=3ab代入就可以
2a-ab+2b/(a+2ab+b)
=2(a+b)-ab/((a+b)+2ab)
=(6ab-ab)/(3ab+2ab)
=1
a,b不全为零,若a+b=3ab,求代数式2a-ab+2b/a+2ab+b的值
a,b不全为零,若a+b=3ab,求代数式2a-ab+2b/a+2ab+b的值
数学人气：567 ℃时间：2019-09-29 04:10:10
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