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y x 2 + y : 0,125 = 20,15
y x 2 + y x 4 = 20,15
y x ( 2 + 4 ) = 20,15
y x 8 = 20,15
y = 20,15 : 8
y = 2,51875
mk nhanh nhất k mình nhé
Y x 2 + Y x 8 = 20,15
Y x ( 2 + 8 ) = 20,15
Y x 10 = 20,15
Y = 20,15 : 10
Y = 2,015
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\Rightarrow y\times\left(3,2+6,8\right)=26,68\\ \Rightarrow y\times10=26,68\\ \Rightarrow y=26,68:10\\ \Rightarrow y=2,668\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(y\times7=5,6\%\)
\(\Leftrightarrow y\times7=\dfrac{5,6}{100}\)
\(\Leftrightarrow y=\dfrac{5,6}{100}:7=\dfrac{1}{125}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)2017x0,7+2017x0,2+2017x0,1
=2017x(0,7+0,2+0,1)
=2017x1
=2017
b)=20,15x(23+76+1)
=20,15x100
=2015
![](https://rs.olm.vn/images/avt/0.png?1311)
219,1 + y:y < y \(\times\) 2 + y \(\times\) 4 - y < 230,2 - y + y
219,1 + 1 < y \(\times\) 2 + y \(\times\) 4 - y \(\times\) 1 < 230,2 - ( y - y)
210,1 < y \(\times\) ( 2 + 4 - 1) < 230,2
210,1 < y \(\times\) 5 < 230,2
210,1 : 5 < y < 230,2: 5
42,02 < y < 46,04
y x 2 + y : 0,125 = 20,15
y + 2 : 0,125 = 20,15
y + 16 = 20,15
y = 20,25 - 16
y = 4,15
sai rồi