x/(7.5+2.5)+(x-15)/(7.5-2.5)=9 怎么解
问题描述:
x/(7.5+2.5)+(x-15)/(7.5-2.5)=9 怎么解
答
x/(7.5+2.5)+(x-15)/(7.5-2.5)=9
x/10+(x-15)/5=9
x/10 +x/5-3=9
3x/10=12
x= 12*10/3=40