a) \(\dfrac{5}{3}+\left(-\dfrac{2}{7}\right)-\left(-1,2\right)\)
\(=\dfrac{5}{3}-\dfrac{2}{7}+\dfrac{6}{5}\)
\(=\dfrac{175}{105}-\dfrac{30}{105}+\dfrac{126}{105}\)
\(=\dfrac{271}{105}\)
b) \(\dfrac{-4}{9}+\left(\dfrac{-5}{6}\right)-\dfrac{17}{4}\)
\(=\dfrac{-4}{9}-\dfrac{5}{6}-\dfrac{17}{4}\)
\(=\dfrac{-16}{36}-\dfrac{30}{36}-\dfrac{153}{36}\)
\(=\dfrac{-199}{36}\)
1.Thực hiện phép tính bằng cách hợp lí
a)\(-\dfrac{4}{9}+\left(-\dfrac{5}{6}\right)-\dfrac{17}{4}\) b)\(5\dfrac{1}{2}+\left(-3\right)\) c)\(4\dfrac{9}{11}+\left(-2\dfrac{1}{11}\right)\)
2.tính
a)4,3 - (1,2) b) 0 - (-0,4) c) \(-\dfrac{2}{3}-\dfrac{1}{3}\) d) \(-\dfrac{1}{2}-\dfrac{-1}{6}\)
Mong mọi người giải dùm mình , mình cần gấp lắm
1.Thực hiện phép tính bằng cách hợp lí
a)−49+(\(-\dfrac{5}{6}\))−\(\dfrac{17}{4}\) b\(5\dfrac{1}{2}+\left(-3\right)\) c)\(4\dfrac{9}{11}\)+(−\(2\dfrac{1}{11}\))
2.tính
a)4,3 - (1,2) b) 0 - (-0,4) c) \(-\dfrac{2}{3}-\dfrac{-1}{3}\) d) \(-\dfrac{1}{2}-\dfrac{-1}{6}\)
Mong mọi người giải dùm mình nha , mình cần gấp lắm
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
Tính hợp lý:
a, \(\dfrac{-3}{4}.5\dfrac{3}{13}-0,75.\dfrac{36}{13}\)
b, \(4\dfrac{5}{9}:\left(\dfrac{-5}{7}\right)+\dfrac{49}{9}:\left(\dfrac{-5}{7}\right)\)
c, \(\left(\dfrac{-3}{5}+\dfrac{4}{9}\right):\dfrac{7}{11}+\left(\dfrac{-2}{5}+\dfrac{5}{9}\right):\dfrac{7}{11}\)
d, \(\dfrac{6}{7}:\left(\dfrac{3}{26}-\dfrac{3}{13}\right)+\dfrac{6}{7}:\left(\dfrac{1}{10}-\dfrac{8}{5}\right)\)
3. Thực hiện phép tính sau đây
a.\(\dfrac{4}{3}-\left\{\left(6-\dfrac{-11}{6}\right)-\left(\dfrac{2}{9}+\dfrac{5}{3}\right)\right\}\)
b.\(0.5+\dfrac{1}{3}+0,4+\dfrac{5}{7}+\dfrac{1}{6}-\dfrac{1}{35}\)
1. Tính
\(\left(8\dfrac{9}{4}+\dfrac{2}{7}\right)-\left(-6-\dfrac{3}{7}+\dfrac{5}{4}\right)-\left(3+\dfrac{2}{4}-\dfrac{9}{7}\right)\)
B= 0,25 +3/5 - (1/8-2/5+\(1\dfrac{1}{4}\) )
C=\(\dfrac{2}{3}-\left(\dfrac{-1}{4}\right)+\dfrac{3}{5}-\dfrac{7}{45}-\left(\dfrac{-5}{9}\right)+\dfrac{1}{12}+\dfrac{1}{35}\)
D=\(\left(5-\dfrac{3}{4}+\dfrac{1}{5}\right)-\left(6+\dfrac{7}{4}-\dfrac{8}{5}\right)-\left(2-\dfrac{5}{7}+\dfrac{16}{5}\right)\)
tính nhanh :
a,\(\dfrac{4}{3}\) - [(\(\dfrac{-11}{6}\) )- (\(\dfrac{2}{9}\) + \(\dfrac{5}{3}\))]
b, (8- \(\dfrac{9}{4}\) +\(\dfrac{2}{7}\) ) - ( -6 -\(\dfrac{3}{7}\) +\(\dfrac{5}{4}\) ) - ( 3+ \(\dfrac{2}{4}\) - \(\dfrac{9}{7}\) )
Tinh:
a) \(\dfrac{7}{8}.\left(\dfrac{2}{12}+\dfrac{4}{10}\right)\)
b) \(\dfrac{3}{2}-\dfrac{5}{6}:\left(\dfrac{1}{2}\right)^2+\sqrt{4}\)
c) \(\dfrac{15}{34}+\dfrac{7}{21}+\dfrac{19}{34}-1\dfrac{15}{17}+\dfrac{2}{3}\)
d) \(\left(-2\right)^3.\left(\dfrac{3}{4}-0,25\right):\left(2\dfrac{1}{4}-1\dfrac{1}{6}\right)\)
e) \(16\dfrac{2}{7}:\left(-\dfrac{3}{5}\right)+28\dfrac{2}{7}:\left(-\dfrac{3}{5}\right)\)
GIUP MK T ^ T
