x/(x-120)=12解出来X等于几?急死了~We have math ( )Friday morning.A.on B.in

问题描述:

x/(x-120)=12解出来X等于几?急死了~
We have math ( )Friday morning.
A.on B.in

两边同乘公分母(X-120)得:
X=12(X-120)
解之得:X=1440/11
检验:
当X=1440/11时,原公分母
1440/11-120≠0
∴原方程X=1440/11

1440/11

用on因为在星期前用on

得:x=12x-1440
11x=1440
所以x=1440/11 ,即130又11分之10,约为130.91

x/(x-120)=12
x=12(x-120)
x=12x-12*120
11x=1440
x=1440\11