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\(Y:\dfrac{7}{5}=\dfrac{5}{6}+\dfrac{5}{12}=\dfrac{15}{12}\\ Y=\dfrac{15}{12}\times\dfrac{7}{5}=\dfrac{7}{4}\)
\(y:\dfrac{7}{5}=\dfrac{5}{6}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{5\times2}{6\times2}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{10}{12}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{15}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{5}{4}\\ \Leftrightarrow y=\dfrac{5}{4}\times\dfrac{7}{5}\\ \Leftrightarrow y=\dfrac{7}{4}\)
\(\Rightarrow C\)
\(y+\frac{1}{2}y=\frac{4}{5}\\ 1y+\frac{1}{2}y=\frac{4}{5}y\\ \left(1+\frac{1}{2}\right)y=\frac{4}{5}\\ \frac{3}{2}y=\frac{4}{5}\\ y=\frac{4}{5}:\frac{3}{2}\\ y=\frac{4}{5}\times\frac{2}{3}\\ y=\frac{8}{15}\)
y + 1/2 x y =4/5
y x 2 = 4/5-1/2
y x 2 = 3/10
y= 3/10 x2
y = 6/10=3/5
4/5+6=4/5+30/5=34/5
1/2+1/3+7/12=6/12+4/12+7/12=17/12
3/4-5/12=9/12-5/12=4/12
2/3:4/3*5=1/2*5=1/2*5/1=5/2
\(\frac{20}{16}+\frac{3}{15}+\frac{2}{12}+\frac{3}{4}+\frac{4}{5}+\frac{5}{6}\)
\(=\frac{5}{4}+\frac{1}{5}+\frac{1}{6}+\frac{3}{4}+\frac{4}{5}+\frac{5}{6}\)
\(=\left(\frac{5}{4}+\frac{3}{4}\right)+\left(\frac{1}{5}+\frac{4}{5}\right)+\left(\frac{1}{6}+\frac{5}{6}\right)\)
\(=2+1+1\)
\(=4\)
Bài giải
\(\frac{2}{3}+\frac{3}{4}+\frac{4}{5}=\frac{40}{60}+\frac{45}{60}+\frac{48}{60}=\frac{133}{60}\)
\(\frac{8}{5}+\frac{7}{6}+\frac{10}{9}+\frac{1}{2}=\frac{144}{90}+\frac{105}{90}+\frac{100}{90}+\frac{45}{90}=\frac{394}{90}\)
\(\frac{15}{17}-\frac{11}{13}+\frac{3}{26}=\frac{390}{442}+\frac{374}{442}+\frac{51}{442}=\frac{815}{442}\)
\(\frac{9}{12}\text{ x }\frac{4}{3}\text{ : }\frac{8}{5}=\frac{9}{12}\text{ x }\frac{4}{3}\text{ x }\frac{5}{8}=\frac{9\text{ x }4\text{ x }5}{12\text{ x }3\text{ x }8}=\frac{5}{8}\)
\(\frac{4}{5}\text{ x }\frac{15}{8}\text{ : }\frac{5}{7}=\frac{4}{5}\text{ x }\frac{15}{8}\text{ x }\frac{7}{5}=\frac{4\text{ x }15\text{ x }7}{5\text{ x }8\text{ x }5}=\frac{21}{10}\)
\(\frac{2}{3}+\frac{3}{4}+\frac{4}{5}=\frac{40}{60}+\frac{45}{60}+\frac{48}{60}=\frac{133}{60}\)
\(\frac{8}{5}+\frac{7}{6}+\frac{10}{9}+\frac{1}{2}=\frac{144}{90}+\frac{105}{90}+\frac{100}{90}+\frac{45}{90}=\frac{197}{45}\)
\(\frac{15}{17}-\frac{11}{13}+\frac{1}{26}=\frac{390}{442}+\frac{374}{442}+\frac{51}{442}=\frac{815}{442}\)
\(\frac{9}{12}\times\frac{4}{3}:\frac{8}{5}=1:\frac{8}{5}=\frac{5}{8}\)
\(\frac{4}{5}\times\frac{15}{8}:\frac{5}{7}=\frac{3}{2}:\frac{5}{7}=\frac{21}{10}\)
\(\frac{5}{6}+y=2\)
\(\Leftrightarrow y=2-\frac{5}{6}\)
\(\Leftrightarrow y=\frac{12}{6}-\frac{5}{6}\)
\(\Leftrightarrow y=\frac{7}{6}\)
Vậy ........
y – 2/3 = 5/6 x 4/5
y – 2/3 = 2/3
y= 2/3 + 2/3
y = 4/3
\(\left(y-\dfrac{2}{3}\right):\dfrac{4}{5}=\dfrac{5}{6}\)
\(y-\dfrac{2}{3}=\dfrac{5}{6}\times\dfrac{4}{5}\)
\(y-\dfrac{2}{3}=\dfrac{2}{3}\)
\(y=\dfrac{2}{3}+\dfrac{2}{3}\)
\(y=\dfrac{4}{3}\)