来自卢少波的问题
一道分式方程要解法x-5分之x-4+x-1分之3=x平方-1分之6x-5分之x-4+x-1分之3=x-8分之x-7-x-9分之x-8=x-5分之x-4
一道分式方程要解法
x-5分之x-4+x-1分之3=x平方-1分之6
x-5分之x-4+x-1分之3=x-8分之x-7-x-9分之x-8=x-5分之x-4
1回答
2020-09-22 15:36
一道分式方程要解法x-5分之x-4+x-1分之3=x平方-1分之6x-5分之x-4+x-1分之3=x-8分之x-7-x-9分之x-8=x-5分之x-4
一道分式方程要解法
x-5分之x-4+x-1分之3=x平方-1分之6
x-5分之x-4+x-1分之3=x-8分之x-7-x-9分之x-8=x-5分之x-4
(x-4)(x+1)(x-1)/(x-5)(x+1)(x-1)+3(x-5)(x+1)/(x-5)(x+1)(x-1)=6(x-5)/(x-5)(x+1)(x-1)
(x-4)(x+1)(x-1)/(x-5)(x+1)(x-1)+3(x-5)(x+1)/(x-5)(x+1)(x-1)-6(x-5)/(x-5)(x+1)(x-1)=0
(x-4)(x+1)(x-1)+3(x-5)(x+1)-6(x-5)/(x-5)(x+1)(x-1)=0
(x-4)(x+1)(x-1)+3(x-5)(x+1)-6(x-5)=0
(x-4)(x+1)(x-1)+3(x-5)(x+1)=6(x-5)
(x+1)(x2-4x-x+4+3x-15)=6x-30
(x+1)(x2-2x-11)=6x-30
(x+1)(x2-2x+1-12)=6x-30
(x+1)(x-1)2-12x-12=6x-30
(x+1)(x-1)2=18(x-1)
(x+1)(x-1)=18
x2-1=18
x2=19
x=正负根号19