(X-100)*10%+100={X-[(X-100)*10%+100]-200}*10%+200

问题描述:

(X-100)*10%+100={X-[(X-100)*10%+100]-200}*10%+200
括号计算先后顺序分别是()、[]、{}

0.1x+90={X-[0.1x+90]-200}*10%+200
0.1x+90={0.9x-290}*10%+200
0.1x+90=0.09x+171
0.01x=81
x=8100