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TL:
8/15 x 5/6 = 40/90 = 4/9
41/20 x 3/4 = 123/80
(11/23 + 9/23) + (18/23 + 2/23) = 20/23 + 20/23 = 40/43
HT
\(\left(\frac{2}{3}\times\frac{4}{5}\right)\times\frac{5}{6}\) = \(\frac{2}{3}\times\frac{4}{5}\times\frac{5}{6}\)=\(\frac{2\times4\times5}{3\times5\times6}\)=\(\frac{2\times4\times5}{3\times5\times2\times3}\)=\(\frac{4}{9}\)
\(\frac{11}{23}+\frac{2}{23}+\frac{9}{23}+\frac{18}{23}\)=\(\frac{\left(11+9\right)+\left(18+2\right)}{23}\)=\(\frac{20+20}{23}\)=\(\frac{40}{23}\)
\(\frac{27}{12}+\frac{17}{6}-\frac{25}{36}-\frac{15}{6}\)=\(\left(\frac{27}{12}-\frac{25}{36}\right)+\left(\frac{17}{6}-\frac{15}{6}\right)\)=\(\frac{14}{9}+\frac{2}{6}\)=\(\frac{17}{9}\)
/HT\
23/6 :x - 2/5 = 1/4
23/6 : x = 13/20
x = 23/6 . 20/13
x = 230/39
\(\frac{23}{6}\div x-\frac{2}{5}=\frac{1}{4}\)
\(\frac{23}{6}\div x=\frac{1}{4}+\frac{2}{5}\)
\(\frac{23}{6}\div x=\frac{13}{20}\)
\(x=\frac{23}{6}\div\frac{13}{20}\)
\(x=\frac{230}{39}\)
Vậy x = \(\frac{230}{39}\)
23/6 :x - 2/5 = 1/4
23/6 : x = 1/4 + 2/5 = 13/20
x = 23/6 : 13/20 = 230/39
23/6 : x - 2/5 = 1/4
23/6 : x = 1/4 + 2/5
23/6 : 6 = 13/20
x = 23/6 : 13/20
x = 230/39
\(\frac{23}{6}:x-\frac{2}{5}=\frac{1}{4}\)
\(\frac{23}{6}:x=\frac{1}{4}+\frac{2}{5}\)
\(\frac{23}{6}:x=\frac{11}{20}\)
\(x=\frac{23}{6}:\frac{11}{20}\)
\(x=\frac{23}{6}\)
a)
\(\frac{1}{4}\)+x=\(\frac{5}{2}\)*\(\frac{8}{7}\)
\(\frac{1}{4}\)+x=\(\frac{20}{7}\)
x=\(\frac{20}{7}\)-\(\frac{1}{4}\)
x=\(\frac{73}{28}\)
b)
\(\frac{7}{3}\)-x=\(\frac{11}{5}\):\(\frac{5}{6}\)
\(\frac{7}{3}\)-x=\(\frac{66}{25}\)
x=\(\frac{66}{25}\)+\(\frac{7}{3}\)
x=\(\frac{373}{75}\)
c)
\(\frac{23}{6}\):x-\(\frac{2}{5}\)=\(\frac{1}{4}\)
\(\frac{23}{6}\):x =\(\frac{1}{4}\)+\(\frac{2}{5}\)
\(\frac{23}{6}\):x =\(\frac{13}{20}\)
x =\(\frac{23}{6}\):\(\frac{13}{20}\)
x =\(\frac{269}{60}\).
23/6 : x = 1/4+2/5=13/20
x=23/6 : 13/20
x = 230/39
h cho minh roi minh trả loi cho