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\(y:\frac{1}{4}+y:\frac{1}{8}-y:\frac{1}{2}=10\)
\(\Leftrightarrow y.4+y.8-y.2=10\)
\(\Leftrightarrow y.\left(8+4-2\right)=10\)
\(\Leftrightarrow10y=10\)
\(\Leftrightarrow y=10:10=1\)
Vậy y=1
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Ta có : \(y:\frac{1}{4}+y:\frac{1}{8}-y:\frac{1}{2}=10\)
=> y x 4 + y x 8 - y x 2 = 10
=> y x (4 + 8 - 2) = 10
=> y x 10 = 10
=> y = 1
Vậy y = 1
\(y\times\dfrac{1}{2}+y\times\dfrac{1}{6}+y\times\dfrac{1}{12}+y\times\dfrac{1}{20}=\dfrac{8}{5}\)
\(y\times\left(\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}+\dfrac{1}{20}\right)=\dfrac{8}{5}\)
\(y\times\dfrac{4}{5}=\dfrac{8}{5}\)
\(\dfrac{8}{5}:\dfrac{4}{5}\)
\(y=\dfrac{8}{4}=2\)
\(5\times y=2\\ y=2:5\\ y=0,4\) \(\dfrac{8}{5}-y=\dfrac{1}{3}\\ y=\dfrac{8}{5}-\dfrac{1}{3}\\ y=\dfrac{23}{15}\)
a.34 + Y x 1/5 = 7/8
Y x 1/5 = 7/8 - 34
Y x 1/5 = -33,125
Y = -33,125 : 1/5
Y= -165,625
b.7 x Y - 36 = 4 x Y + 504
7 x Y - 4 x Y = 504 + 36
3 x Y = 540
Y = 180
c.Y x 4 + Y x 5 = 720
Y x 9 = 720
Y = 80
a) 34+y x 1/5=7/8
y x 1/5=7/8-34
y x 1/5=-265/8
y =-265/8 : 1/5
y = -1325/8
b) 7 x y - 36 = 4 x y + 504
7 x y - 4 x y = 504 + 36
y x ( 7-4 ) = 540
y x 3 = 540
y = 540 :3
y = 180
c ) y x 4 + y x 5=720
y x ( 4+5 ) =720
y x 9 = 720
y = 720 : 9
y = 80
a) y + 3/7 x 21/9 = 5
y + 3/7 x 7/3 = 5
y + 1 = 5
y = 4
b) y x 3/5 - 1/2 = 4/5
y x 3/5 = 4/5 + 1/2
y x 3/5 = 13/10
y = 13/6
c) 9/8 - y + 2/5 = 1/4
y - 2/5 = 9 /8 - 1/4
y - 2/5 = 7/8
y = 51/40
d) y - 6/5 : 2/3 = 5/6
y - 9/5 = 5/6
y = 79/30
e) y : 7/8 + 3/4 = 7/4
y : 7/8 = 1
y = 7/8
\(\frac{7}{8}\)- y = \(\frac{1}{2}\)+ \(\frac{1}{8}\)
\(\frac{7}{8}\)- y = \(\frac{5}{8}\)
y = \(\frac{7}{8}\)- \(\frac{5}{8}\)
y = \(\frac{1}{4}\)
suy ra y : ( 1/2+1/8+1/8) =36
y : 3/4 =36
y = 36 x 3/4
y = 27
y : ( 1/2+1/8+1/8) =36
y : 3/4 =36
y = 36 x 3/4
y = 27