100+100(x-1)(1-25%)=100x(1-20%)如何解?
问题描述:
100+100(x-1)(1-25%)=100x(1-20%)如何解?
答
100+100*(0.75)(x-1)=100X(0.8)
100+75(x-1)=80X
100+75X-75=80X
25=5X
x=5