化简10/x+10/x+5=90/100
问题描述:
化简10/x+10/x+5=90/100
答
10/x+10/(x+5)=90/100
1/x+1/(x+5)=9/100
(x+6)/x(x+5)=9/100
9x(x+5)=100(x+6)
9x^2+45x-100x-600=0
9x^2-55x-600=0