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\(y\text{×}7,5+y+y\text{×}91,4+y:10=257,8\)
\(y\text{×}7,5+y\text{×}1+y\text{×}91,4+y\text{×}0,1=257,8\)
\(y\text{×}\left(7,5+1+91,4+0,1\right)=257,8\)
\(y\text{×}100=257,8\)
\(y=257,8:100\)
\(y=2,578\)
a) \(y:10+y.3,9=4,8\)
\(\Rightarrow y.0,1+y.3,9=4,8\)
\(\Rightarrow y.\left(0,1+3,9\right)=4,8\)
\(\Rightarrow y.4=4,8\)
\(\Rightarrow y=1,2\)
Vậy y = 1,2
b) \(y.2,5+y.7,5=12,8\)
\(\Rightarrow y.\left(2,5+7,5\right)=12,8\)
\(\Rightarrow y.10=12,8\)
\(\Rightarrow y=1,28\)
Vậy y = 1,28
\(a.\left(y.100-0,7357\right):0,01=0,55+15,88\)
\(\Leftrightarrow\left(100y-0,7357\right):0,01=16,43\)
\(\Leftrightarrow100y-0,7357=0,1643\)
\(\Leftrightarrow100y=0,9\)
\(\Leftrightarrow y=\frac{9}{1000}\)
\(b.14:\left(0,4+\frac{0,16}{y}\right)=7\)
\(\Leftrightarrow0,4+\frac{0,16}{y}=2\)
\(\Leftrightarrow\frac{0,16}{y}=1,6\)
\(\Leftrightarrow x=0,1\)
\(c.520+7,5.4=y+\frac{175}{5}+30\)
\(\Leftrightarrow520+30=y+65\)
\(\Leftrightarrow550=y+65\)
\(\Leftrightarrow y=485\)
11,5 x y + 7,5 x y + y = 30
( 11,5 + 7,5 + 1 ) x y = 30
20 x y = 30
y = 30 : 20
y = 1,5
bạn ơi sao mình nhập 1.5 vào mà nó cứ nhân sai ko ra 30
\(y:2,5+9,6\cdot y=7,5-3\)
\(y:\frac{25}{10}+9,6\cdot y=4,5\)
\(y\cdot\frac{10}{25}+9,6\cdot y=4,5\)
\(y\cdot0,4+9,6\cdot y=4,5\)
\(y\left(0,4+9,6\right)=4,5\)
\(y\cdot10=4,5\)
\(\Rightarrow y=0,45\)
P/s: Hoq chắc :<
y : 2,5 + 9,6 x y = 7,5 - 3
y : \(\frac{25}{10}\) + \(\frac{96}{10}\) x y = 3,5
y x \(\frac{10}{25}\)+ \(\frac{96}{10}\) x y = 3,5
y x (\(\frac{2}{5}+\frac{48}{5}\)) = \(\frac{35}{10}\)
y x \(\frac{50}{5}\)= \(\frac{7}{2}\)
y x 10 = \(\frac{7}{2}\)
y = \(\frac{7}{2}\) : 10
y = \(\frac{7}{2}\) x \(\frac{1}{10}\)
y = \(\frac{7}{20}\)
Ko bik đúng hay ko nữa, sai thì thui đừng k sai nha
a) y : 10 + y x 3,9 = 4,8
y x 0,1 + y x 3,9 = 4,8
y x ( 0,1 + 3,9 ) = 4,8
y x 4 = 4,8
y = 1,2
b)y : 0,25 + y x 11 = 24
y x 4 + y x 11 = 24
y x ( 4 + 11 ) = 24
y x 15 = 24
y = 1,6
c) 75% x y + 3/4 x y + y = 30
3/4 x y + 3/4 x y + y x 1 = 30
y x ( 3/4 + 3/4 + 1 ) = 30
y x 2,5 = 30
y = 12
\(y:0,25+y.11=24\)
\(\Leftrightarrow y.4+y.11=24\)
\(\Leftrightarrow y.\left(4+11\right)=24\)
\(\Leftrightarrow y.15=24\)
\(\Leftrightarrow y=\frac{24}{15}=\frac{8}{5}\)
y x 125 + y x 876 - y x 1 = 126722
y x (125 + 876 - 1) = 126722
y x 1000 = 126722
y = 126,722
~hok tot~
Y x 125 + Y x 876 - Y = 126722
=> Y( 125 + 876 - 1 ) = 126722
=> 1000Y = 126722
=> Y = 126,722
y x 7,5 + y + y x 91,4 + y : 10 = 257,8
y x 7,5 + y x 1 + y x 91,4 + y x 0,1 = 257,8
y x (7,5 + 1 + 91,4 + 0,1) = 257,8
y x 100 = 257,8
y = 257,8 : 100
y = 2,578