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36 : 2 x ( y - 1 ) = 10
18y - 18 = 10
18y = 10 + 18
18y = 28
y = 14/9
\(\frac{1}{5}\)+ \(\frac{3}{5}y\)=\(\frac{24}{25}\)
suy ra 3/5y =24/25-1/5
suy ra 3/5y =19/25
suy ra y = 19/25:3/5
suy ra y = 19/15
7/4-y x 5/6 = 1/2+1/3
7/4-y x 5/6=5/6
y x 5/6=7/4-5/6
y x 5/6=11/12
y=11/12 : 5/6
y=11/10
\(\frac{7}{4}-y\times\frac{5}{6}=\frac{1}{2}+\frac{1}{3}\)
\(\frac{7}{4}-y\times\frac{5}{6}=\frac{5}{6}\)
\(\frac{7}{4}-y=\frac{5}{6}\div\frac{5}{6}\)
\(\frac{7}{4}-y=1\)
\(y=1+\frac{7}{4}\)
\(y=\frac{11}{4}\)
5 / 6 x y - y : 3 / 2 = 1
5 / 6 x y - y x 2 / 3 = 1
y x ( 5 / 6 - 2 / 3 ) = 1
y x 1 / 6 = 1
y = 1 : 1 / 6
y = 6
vậy y = 6 nha ánh
a) \(\frac{7}{10}-y\cdot\frac{3}{4}=\frac{1}{5}\)
\(y\cdot\frac{3}{4}=\frac{7}{10}-\frac{1}{5}\)
\(y\cdot\frac{3}{4}=\frac{1}{2}\)
\(y=\frac{1}{2}:\frac{3}{4}\)
\(y=\frac{1}{2}\cdot\frac{4}{3}\)
\(y=\frac{2}{3}\)
b) \(\frac{5}{6}:\left(y+\frac{7}{9}\right)=\frac{3}{4}\)
\(y+\frac{7}{9}=\frac{5}{6}:\frac{3}{4}\)
\(y+\frac{7}{9}=\frac{5}{6}\cdot\frac{4}{3}\)
\(y+\frac{7}{9}=\frac{10}{9}\)
\(y=\frac{10}{9}-\frac{7}{9}\)
\(y=\frac{3}{9}=\frac{1}{3}\)
**** !
a, \(\frac{7}{10}-y\times\frac{3}{4}=\frac{1}{5}\)
\(\Rightarrow y\times\frac{3}{4}=\frac{7}{10}-\frac{1}{5}\)
\(\Rightarrow y\times\frac{3}{4}=\frac{1}{2}\)
\(\Rightarrow y=\frac{1}{2}\div\frac{3}{4}\)
\(\Rightarrow y=\frac{1}{3}\)
b, \(\frac{5}{6}\div\left(y+\frac{7}{9}\right)=\frac{3}{4}\)
\(\Rightarrow y+\frac{7}{9}=\frac{5}{6}\div\frac{3}{4}\)
\(\Rightarrow y+\frac{7}{9}=\frac{10}{9}\)
\(\Rightarrow y=\frac{10}{9}-\frac{7}{9}\)
\(\Rightarrow y=\frac{1}{3}\)
\(\frac{yx\left(y+1\right)}{2}=36\Rightarrow yx\left(y+1\right)=72=8x9\)
=>y=8
Ta có : ( 1 + y ) x ( ( y - 1 ) : 2 + 1 ) : 2 = ( 1 + y ) x ( y + 1 ) : 2 : 2 = ( y + 1 ) x ( y + 1 ) : 4 = 36
= > ( y + 1 ) x ( y + 1 ) = 36 x 4 = 144 = 12 x 12
= > y + 1 = 12
= > y = 11