(2X-50):(X+50)=80:(X-80)怎么解
问题描述:
(2X-50):(X+50)=80:(X-80)怎么解
答
2(x-25)/(x+50)=80/(x-80)
(x-25)/(x+50)=40/(x-80)
(x-25)*(x-80)=40*(x+50)
x^2-80x-25x+2000=40x+2000
x=0或145
答
(2X-50):(X+50)=80:(X-80)
(X+50)*80=(2X-50)(X-80)
80X+4000=2X^2-210X+4000
X^2-145X=0
X(X-145)=0
X=0或X=145