x(-1/10x+11)=280,解方程,有追分哦
人气:408 ℃ 时间:2020-02-06 03:40:21
解答
x(-1/10x+11)=280
-1/10x²+11x-280=0
x²-110x+2800=0
(x-40)(x-70)=0
x1=40 x2=70x1=40x2=70请问这是什么意思啊??有两个解呀 分别是40 和70
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