\(-\dfrac{3}{4}.31\dfrac{11}{23}-0,75.8\dfrac{11}{23}\)
\(=\dfrac{3}{4}.\left(-31\dfrac{11}{23}\right)-\dfrac{3}{4}.8\dfrac{11}{23}\)
\(=\dfrac{3}{4}.\left(-31\dfrac{11}{23}-8\dfrac{11}{23}\right)\)
\(=\dfrac{3}{4}.\left(-39\right)\)
\(=-\dfrac{117}{4}\)
\(\dfrac{8}{9}\)+ \(\dfrac{15}{23}\)+ \(\dfrac{1}{9}\)+\(\dfrac{-15}{23}\)+\(\dfrac{1}{2}\)
Bài tập:
a) 0,24 . \(/dfrac{-15}{4}\)
b) \(/dfrac{7}{23}\) . [(\(/dfrac{-8}{6}-/dfrac{45}{18}\))]
\(\dfrac{0,75-0,6+\dfrac{3}{7}+\dfrac{3}{13}}{2,75-2,2+\dfrac{11}{7}+\dfrac{11}{3}}=\dfrac{\dfrac{3}{4}-\dfrac{3}{5}+\dfrac{3}{7}+\dfrac{3}{13}}{\dfrac{11}{4}-\dfrac{11}{5}+\dfrac{11}{7}+\dfrac{11}{13}}\)
Tính A =\(\dfrac{10\dfrac{1}{3}\left(26\dfrac{1}{3}\dfrac{176}{7}\right)-\dfrac{12}{11}\left(\dfrac{10}{3}-1,75\right)}{\dfrac{5}{\left(91-0,25\right).\dfrac{60}{11}-1}}\) .
Tìm x \(\in\) Z biết :
a, \(4\dfrac{3}{5}\) . \(2\dfrac{4}{23}\) \(\le\) x \(\le\) \(-2\dfrac{3}{5}\) : \(1\dfrac{6}{15}\)
b, \(-4\dfrac{1}{3}\) . \(\left(\dfrac{1}{2}-\dfrac{1}{6}\right)\) \(\le\) x \(\le\) \(\dfrac{-2}{3}\) . \(\left(\dfrac{1}{3}-\dfrac{1}{2}-\dfrac{3}{4}\right)\)
a)\(\dfrac{-12}{15}+\dfrac{-4}{26}\) b)\(5\dfrac{1}{3}-2\dfrac{4}{5}\)
c)\(\dfrac{4}{5}-\left(-\dfrac{2}{7}\right)+-\dfrac{5}{10}\) d)\(-1\dfrac{2}{7}+\dfrac{3}{14}-\dfrac{5}{21}\)
e)\(12-\dfrac{11}{121}+\left(-\dfrac{8}{9}\right)-\left(-\dfrac{3}{7}\right)\) f) \(\dfrac{11}{12}-\left(1\dfrac{3}{4}\right)-\dfrac{2}{16}\)
tinh nhanh
A=\(\dfrac{1}{3}-\dfrac{3}{4}-\left(\dfrac{-3}{5}\right)+\dfrac{1}{64}-\dfrac{2}{9}-\dfrac{1}{36}+\dfrac{1}{15}\)
B=\(\dfrac{1}{3}-\dfrac{3}{5}+\dfrac{5}{7}-\dfrac{7}{9}+\dfrac{9}{11}-\dfrac{11}{3}+\dfrac{13}{15}+\dfrac{11}{15}-\dfrac{9}{11}+\dfrac{7}{9}+\dfrac{7}{9}-\dfrac{5}{7}+\dfrac{3}{3}-\dfrac{1}{3}\)
giup minh nhe minh dang can gap
Thực hiện phép tính
a. \(\dfrac{-1}{24}-\left\{\dfrac{1}{4}-\left(\dfrac{1}{2}-\dfrac{7}{8}\right)\right\}\)
b.\(\left(8\dfrac{5}{11}+3\dfrac{5}{8}\right)-3\dfrac{5}{11}\)
c.\(\dfrac{4}{9}:\left(\dfrac{-1}{7}\right)+6\dfrac{5}{9}:\left(\dfrac{-1}{7}\right)\)
d. \(\left(\dfrac{-1}{5}+\dfrac{3}{7}\right):\dfrac{2}{11}+\left(\dfrac{-4}{5}+\dfrac{4}{7}\right):\dfrac{2}{11}\)
M.n giúp mk nha
a)2x.(x-\(\dfrac{1}{7}\) ) =0
b) \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)
c) \(4\dfrac{5}{9}:2\dfrac{5}{18}-7< x< \left(3\dfrac{1}{5}:3,2+4,5.1\dfrac{31}{45}\right)\)
