a+b=10 ab=-2 a=?b=?3a-(5ab-3b)=?
人气：418 ℃ 时间：2020-04-04 15:46:11
解答
3a-(5ab-3b)
=3a-5ab+3b
=3(a+b)-5ab
=3*10+5*2
=40
a=5+/-2倍根号27
b=5-/+根号27
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