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\(\left(y-\frac{2}{5}\right):\frac{4}{3}=\frac{3}{8}\)
\(y-\frac{2}{5}=\frac{3}{8}.\frac{4}{3}\)
\(y-\frac{2}{5}=\frac{1}{2}\)
\(y=\frac{1}{2}+\frac{2}{5}\)
\(\Rightarrow y=\frac{9}{10}\)
\(y.\frac{5}{6}=\frac{1}{4}+\frac{1}{3}\)
\(y.\frac{5}{6}=\frac{7}{12}\)
\(y=\frac{7}{12}:\frac{5}{6}\)
\(y=\frac{7}{12}.\frac{6}{5}\)
\(\Rightarrow y=\frac{7}{10}\)
a ) \(\left(y-\frac{2}{5}\right):\frac{4}{3}=\frac{3}{8}\)
\(\left(y-\frac{2}{5}\right)=\frac{3}{8}\times\frac{4}{3}\)
\(y-\frac{2}{5}=\frac{1}{2}\)
\(y=\frac{1}{2}+\frac{2}{5}\)
\(y=\frac{5}{10}+\frac{4}{10}\)
\(y=\frac{9}{10}\)
Vậy \(y=\frac{9}{10}\)
b ) \(y\times\frac{5}{6}=\frac{1}{4}+\frac{1}{3}\)
\(y\times\frac{5}{6}=\frac{3}{12}+\frac{4}{12}\)
\(y\times\frac{5}{6}=\frac{7}{12}\)
\(y=\frac{7}{12}:\frac{5}{6}\)
\(y=\frac{7}{12}\times\frac{6}{5}\)
\(y=\frac{7}{10}\)
Vậy \(y=\frac{7}{10}\)
Chúc bạn học tốt !!!
1)
( y - 1/5 ) : 2/3 = 3/4
y - 1/5 = 3/4 x 2/3
y - 1/5 = 1/2
y = 1/2 + 1/5
y = 7/10.
2)
7/4 - y x 5/6 = 1/2 + 1/3
7/4 - y x 5/6 = 5/6
7/4 - y = 5/6 : 5/6
7/4 - y = 1
y = 7/4 - 1
y = 3/4
C1 :(y-1/5):2/3=3/4
y-1/5=3/4.2/3
y-15=1/2
y=1/2+15
y=31/2
C2:
7/4-y.5/6=1/2+1/3
7/4-y.5/6=5/6
y.5/6=7/4-5/6
y.5/6=11/12
y=11/12:5/6
y=11/10
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
\(\left(y-\frac{4}{5}\right):\frac{4}{5}=\frac{5}{8}\) => \(y-\frac{4}{5}=\frac{1}{2}\)=> \(y=\frac{13}{10}\)
#Hk_tốt
#Ken'z
\(Y:\dfrac{7}{5}=\dfrac{5}{6}+\dfrac{5}{12}=\dfrac{15}{12}\\ Y=\dfrac{15}{12}\times\dfrac{7}{5}=\dfrac{7}{4}\)
\(y:\dfrac{7}{5}=\dfrac{5}{6}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{5\times2}{6\times2}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{10}{12}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{15}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{5}{4}\\ \Leftrightarrow y=\dfrac{5}{4}\times\dfrac{7}{5}\\ \Leftrightarrow y=\dfrac{7}{4}\)
\(\Rightarrow C\)
a) \(y=\dfrac{9}{10}\)
b) \(y=\dfrac{4}{5}\)