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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
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
\(a.\left(y.100-0,7357\right):0,01=0,55+15,88\)
\(\Leftrightarrow\left(100y-0,7357\right):0,01=16,43\)
\(\Leftrightarrow100y-0,7357=0,1643\)
\(\Leftrightarrow100y=0,9\)
\(\Leftrightarrow y=\frac{9}{1000}\)
\(b.14:\left(0,4+\frac{0,16}{y}\right)=7\)
\(\Leftrightarrow0,4+\frac{0,16}{y}=2\)
\(\Leftrightarrow\frac{0,16}{y}=1,6\)
\(\Leftrightarrow x=0,1\)
\(c.520+7,5.4=y+\frac{175}{5}+30\)
\(\Leftrightarrow520+30=y+65\)
\(\Leftrightarrow550=y+65\)
\(\Leftrightarrow y=485\)
y x 6 - 4,99 = 25
y x 6=25+4,99=29,99
y=29,99:6=4.9983.......
a: =>y+1,2=(5,34-10,34):5=-1
=>y=-2,2
b: =>x(x+1)/2=111a
=>x(x+1)=222a
=>\(x\in\varnothing\)
x + 5 + y + 5 + x + 5 + y + 5 = ?
( x + y ) + ( x + y ) + 5 + 5 + 5 + 5 = ?
20 + 20 + 5 + 5 + 5 + 5 = 60
chúc bạn hok tốt!!!
tick mk nhaa!!!
c)\(\dfrac{3}{8}\times\dfrac{5}{8}+y=\dfrac{5}{4}\)
\(\dfrac{15}{64}+y=\dfrac{5}{4}\)
\(y=\dfrac{5}{4}-\dfrac{15}{64}\)
\(y=\dfrac{65}{64}\)
d, \(\dfrac{3}{8}+\dfrac{5}{8}\times y=\dfrac{5}{4}\)
\(\dfrac{5}{8}\times y=\dfrac{5}{4}-\dfrac{3}{8}\)
\(\dfrac{5}{8}\times y=\dfrac{7}{8}\)
\(y=\dfrac{7}{8}:\dfrac{5}{8}\)
\(y=\dfrac{7}{5}\)
a, 3/4 x y = 3/5 + 3/10
3/4 x y = 9/10
y = 9/10 : 3/4
y = 6/5
b, 3/5 : y = 3/4 - 2/5
3/5 : y = 7/20
y = 3/5 : 7/20
y = 12/7
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