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9/6 - y x 5/6 = 1/2 + 2/3
9/6 - y x 5/6 = 7/6
y x 5/6 = 9/6 - 7/6
y x 5/6 = 2/6
y = 2/6 : 5/6
y = 2/5
Bài làm
a) \(\left(\frac{2}{5}+\frac{3}{5}\right)x\frac{5}{3}\)
\(=\frac{5}{5}x\frac{5}{3}\)
\(=\frac{5}{3}\)
b) \(1:\frac{5}{6}-1\)
\(=1x\frac{6}{5}-1\)
\(=\frac{6}{5}-\frac{5}{5}\)
\(=\frac{1}{5}\)
~ Lớp 3 hok cái này r. ~
# Học tốt #
\(\left(\frac{3}{5}-x\right)+\frac{13}{20}=\frac{5}{6}\)
\(\frac{3}{5}-x=\frac{5}{6}-\frac{13}{20}\)
\(\frac{3}{5}-x=\frac{11}{60}\)
\(x=\frac{3}{5}-\frac{11}{60}\)
\(x=\frac{5}{12}\)
\(\left(x-\frac{1}{2}\right)\cdot\frac{5}{3}=\frac{7}{4}-\frac{1}{2}\)
\(\left(x-\frac{1}{2}\right)\cdot\frac{5}{3}=\frac{5}{4}\)
\(x-\frac{1}{2}=\frac{5}{4}:\frac{5}{3}\)
\(x-\frac{1}{2}=\frac{3}{4}\)
\(x=\frac{3}{4}+\frac{1}{2}\)
\(x=\frac{5}{4}\)
( 3/5 - x ) + 13/20 = 5/6
3/5 - x = 5/6 - 13/20
3/5 - x = 89/60
x = 3/5 - 89/60
x = 25/12
( x - 1/2 ) x 5/3 = 7/4 - 1/2
( x - 1/2 ) x 5/3 = 5/4
x - 1/2 = 5/4 : 5/3
x - 1/2 = 35/12
x = 35/12 + 1/2
x = 41/12
\(\frac{1}{2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{5.6}\\ \frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}\\ \)
\(\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-...-\frac{1}{6}\)
\(\frac{1}{2}+\frac{1}{2}-\frac{1}{6}\)
\(1-\frac{1}{6}\\ \frac{5}{6}\)
k nha bn
\(\dfrac{22}{5}\times\dfrac{6}{121}\times\dfrac{11}{4}\times\dfrac{3}{5}\times\dfrac{1}{3}\times\dfrac{5}{4}\)
\(=\left(\dfrac{22}{5}\times\dfrac{5}{4}\right)\times\left(\dfrac{6}{121}\times\dfrac{11}{4}\right)\times\left(\dfrac{3}{5}\times\dfrac{1}{3}\right)\)
\(=\dfrac{11}{2}\times\dfrac{3}{22}\times\dfrac{1}{5}\)
\(=\dfrac{3}{20}\)
\(=\dfrac{22\times6\times11\times3\times1\times5}{5\times121\times4\times5\times3\times4}=\dfrac{11\times2\times6\times11\times1}{11\times11\times4\times5\times4}=\dfrac{2\times6\times1}{4\times5\times4}=\dfrac{18}{100}=\dfrac{9}{50}\)
\(\left(\dfrac{1}{2}+\dfrac{1}{3}\right)\times\dfrac{5}{6}\)
\(=\left(\dfrac{3}{6}+\dfrac{2}{6}\right)\times\dfrac{5}{6}\)
\(=\dfrac{5}{6}\times\dfrac{5}{6}\)
\(=\dfrac{10}{12}\)
\(\left(\dfrac{1}{2}+\dfrac{1}{3}\right)\times\dfrac{5}{6}\)
\(=\left(\dfrac{3}{6}+\dfrac{2}{6}\right)\times\dfrac{5}{6}\)
\(=\dfrac{5}{6}\times\dfrac{5}{6}\)
\(=\dfrac{25}{36}\)