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3/5*y-4/5:3+1/12=3/2+1/5
3/5*y-4/5:3+1/12=17/10
3/5*y-4/15=17/10-1/12
3/5*y-4/15=97/60
3/5*y=97/60+4/15
3/5*y=113/60
y=113/60:3/5
y=113/36 ( cho mik nha)
a)\(y=\dfrac{5}{3}-\left(\dfrac{7}{12}:\dfrac{5}{6}\right)=\dfrac{5}{3}-\dfrac{7}{10}=\dfrac{50}{30}-\dfrac{21}{30}=\dfrac{29}{30}\)
b)\(y=\dfrac{4}{15}:\left[\left(\dfrac{4}{5}+\dfrac{1}{2}\right)\times\dfrac{4}{13}\right]=\dfrac{4}{15}:\left[\left(\dfrac{8}{10}+\dfrac{5}{10}\right)\times\dfrac{4}{13}\right]\)
\(y=\dfrac{4}{15}:\left[\dfrac{13}{10}\times\dfrac{4}{13}\right]=\dfrac{4}{15}:\dfrac{2}{5}=\dfrac{2}{3}\)
\(y\times\dfrac{1}{2}+y\times\dfrac{1}{6}+y\times\dfrac{1}{12}+y\times\dfrac{1}{20}=\dfrac{8}{5}\)
\(y\times\left(\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}+\dfrac{1}{20}\right)=\dfrac{8}{5}\)
\(y\times\dfrac{4}{5}=\dfrac{8}{5}\)
\(\dfrac{8}{5}:\dfrac{4}{5}\)
\(y=\dfrac{8}{4}=2\)
2/ Tìm y:
y + \(\dfrac{1}{3}\) x 4 = 12 \(\dfrac{2}{5}\) + y = \(\dfrac{12}{35}\) x \(\dfrac{14}{9}\)
\(y=12-\left(\dfrac{1}{3}\times4\right)=12-\dfrac{4}{3}=\dfrac{32}{3}\)
\(y=\left(\dfrac{12}{35}\times\dfrac{14}{9}\right)-\dfrac{2}{5}=\dfrac{8}{15}-\dfrac{2}{5}=\dfrac{2}{15}\)
Câu 1:
a: Phân số lớn nhất là 11/12
b: Phân số nhỏ nhất là 2/3
Câu 2:
a: \(\Leftrightarrow y=\dfrac{1}{2}-\dfrac{1}{4}=\dfrac{1}{4}\)
b: \(\Leftrightarrow y=\dfrac{8}{12}-\dfrac{3}{12}+\dfrac{5}{12}=\dfrac{10}{12}=\dfrac{5}{6}\)
5/12 + y = 1/2
y = 1/2 - 5/12
y = 6/12 - 5/12
y = 6-5/12
y=1/12