Question

Tìm y :

y + y : 0,5 + y : 0,25 + y : 0,125 = 15

Answer 1

y+y:0,5+y:0,25+y:0,125=15

y+yx1/2+yx1/4+yx1/8=15

y(1+1/2+1/4+1/8)=15

yx15/8=15

x=15:15/8=8

Answer 2

Ta có:

y+y/0,5+y/0,25+y/0,125=15

y+2y+4y+8y=15

y*(1+2+4+8)=15

15*y=15

y=1