(900/x)-(900/(1-1/10)x)=2900 900----- - ---------------------- = 2 x (1-1/10)x求解方程,过程要详细.

问题描述:

(900/x)-(900/(1-1/10)x)=2
900 900
----- - ---------------------- = 2
x (1-1/10)x
求解方程,过程要详细.

900-900/(1-1/10)=2x
90=2x
x=45

900/(1-1/10)=900/(9/10)=1000

900/x-1000/x=2
(900-1000)/x=2
-100/x=2
-100=2x
x=-50