y + y : 0,01 + y : 0,2=2018
=>\(\frac{y}{1}+\frac{y}{0,01}+\frac{y}{0,2}=2018\)
=>\(\frac{0,2Xy}{0,2}+\frac{20Xy}{0,01X20}+\frac{y}{0,2}=\frac{2018X0,2}{0,2}\)
=>\(\frac{0,2y}{0,2}+\frac{20y}{0,2}+\frac{y}{0,2}=\frac{403,6}{0,2}\)
=>\(\frac{0,2y+20y+y}{0,2}=\frac{403,6}{0,2}\)
=>0,2y+20y+y = 403,6
=>(0,2 + 20 + 1)y = 403,6
=>21,2y =403,6
=> y = 403,6 : 21,2
=> y =\(\frac{1009}{53}\) OK CHÚC BẠN HỌC TỐT !!!
a)y+ y: 0,01+ y: 0,2 =2018
y: ( 1+ 0,01 +0,2) =2018
y: 1,21 = 2018
y= 2018x 1,21
y= 2441,78
b)y: 0,25+y+ y: 0,05= 2017
y:( 0,25+ 1+ 0,05)=2017
y:1,3=2017
y=2017x 1,3
y=2622,1