问题已解决
1.75=1.6×2.5/(2.5+1+1.5)+2.5×1/(2.5+1+1.5)+β×1.5/(2.5+1+1.5) 解得:β=1.5,老师,这个解方程的步骤是怎么样的?
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05/25 10:37
廖君老师
05/25 10:43
您好,移项β×1.5/(2.5%2b1%2b1.5)=1.75-(1.6×2.5/(2.5%2b1%2b1.5)%2b2.5×1/(2.5%2b1%2b1.5)),再把β的系数除过来 β=(1.75-(1.6*2.5/(2.5%2b1%2b1.5)%2b2.5*1/(2.5%2b1%2b1.5)))/(1.5/(2.5%2b1%2b1.5))=1.5