y:1/2+y:0,125=9,87
<=> y:(1/2+0,125)=9,87
<=> y:5/8=9,87
<=>y=987/160
Vậy x=987/160
y x 2 +y x 8 =9.87
y x (2 + 8)=9.87
y x 10 = 9.87
y = 98.7
mình tính nhầm y =0.987 nha
y:1/2+y:0,125=9,87
y:0,5+y:0,125=9,87
y.2+y.8=9,87
y.(2+8)=9,87
y.10=9,87
y=9,87:10
y=0,987