co ai biet lam bai nay khong , giup mk voi
50%*x+3/4*x+0,25*x+1/2*x=2015
=1/2*x+3/4*x+1/4*x+1/2*x=2015
=(1/2+3/4+1/4+1/2)*x =2015
= 2*x =2015
= x =2015:2
x = 1007,5.
50 % = 1/2 :; 0,25 = 1/4
=X x ( 1/2 + 3/4 + 1/4 +1/2 ) = 2015
x = 2015: 2
x= 1007,5
t*** nha