已知9+根号13与9-根号13的小数部分分别是a和b,试求代数式ab-3a+4b+8的值
人气:441 ℃ 时间:2019-09-27 06:56:00
解答
9+根号13与9-根号13的小数部分分别是a和b,
a=根号13-3 b=4-根号13
ab-3a+4b+8=(a+4)b-3a+8
=(1+根号13)(4-根号13)+9-3根号13+8
=8
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