(x/2-40)/(x-15)=(x/2+40)/(x/10)怎么计算
问题描述:
(x/2-40)/(x-15)=(x/2+40)/(x/10)怎么计算
答
(x/2-40)/(x-15)=(x/2+40)/(x/10)
得(x/2+40)*(x-15)=(x/2-40)*(x/10)
(x+80)*(x-15)=(x-80)*(x/10)
x^2+65x-1200 = x^2 /10+8x
9x^2+570x-12000=0
3x^2+190x-4000=0
(x+80)*(3x-50)=0
解得:x1 = -80 ,x2=50/3