ta có:\((\dfrac{-7}{4}:\dfrac{5}{8}).\dfrac{11}{16}=(\dfrac{-7}{4}.\dfrac{8}{5}).\dfrac{11}{16}=\dfrac{-56}{20}.\dfrac{11}{16}=\dfrac{-14}{5}.\dfrac{11}{16}=\dfrac{-154}{80}=\dfrac{-77}{40}\)
\(\Rightarrow\)đáp án đúng là D
Tính \(D=\dfrac{2}{45}+\dfrac{1}{99}-\dfrac{2}{77}+\dfrac{4}{105}\)
Tính:
a) \(\dfrac{-3}{4}.\dfrac{12}{-5}.\left(-\dfrac{25}{6}\right);\) b) \(\left(-2\right).\dfrac{-38}{21}.\dfrac{-7}{4}.\left(-\dfrac{3}{8}\right);\)
c) \(\left(\dfrac{11}{12}:\dfrac{33}{16}\right).\dfrac{3}{5};\) d) \(\dfrac{7}{23}.\left[\left(-\dfrac{8}{6}\right)-\dfrac{45}{18}\right].\)
Tính :
a) \(-\dfrac{3}{4}.31\dfrac{11}{23}-0.75.8\dfrac{12}{23}\)
b) \(\left(2\dfrac{1}{3}+3\dfrac{1}{2}\right):\left(-4\dfrac{1}{6}+3\dfrac{1}{7}\right)+7\dfrac{1}{2}\)
c) \(4\dfrac{5}{9}:\left(\dfrac{-5}{7}\right)+5\dfrac{4}{9}:\left(\dfrac{-5}{7}\right)\)
d) \(4\dfrac{25}{16}+25\left(\dfrac{9}{16}:\dfrac{125}{64}:\dfrac{-27}{8}\right)\)
e) \(\dfrac{2}{3}-4\left(\dfrac{1}{2}+\dfrac{3}{4}\right)\)
tính giá trị của mỗi biểu thức A,B,C,D rồi sắp xếp các kết quả tìm được theo thứ tự tăng dần
A=\(\dfrac{5}{4}.\left(5-\dfrac{4}{3}\right).\left(-\dfrac{1}{11}\right)\) B=\(\dfrac{3}{4}:\left(-12\right).\left(-\dfrac{2}{3}\right)\)
C=\(\dfrac{5}{4}:\left(-15\right).\left(-\dfrac{2}{5}\right)\) D=\(\left(-3\right).\left(\dfrac{2}{3}-\dfrac{5}{4}\right):\left(-7\right)\)
Tính giá trị của mỗi biểu thức A,B,C,D rồi sắp xếp các kết quả tìm được theo thứ tự tăng dần:
A= \(\dfrac{5}{4}.\left(5-\dfrac{4}{3}\right).\dfrac{-1}{11}\)
B= \(\dfrac{3}{4}:\left(-12\right).\dfrac{-2}{3}\)
C= \(\dfrac{5}{4}:\left(-15\right).\dfrac{-2}{5}\)
D= \(\left(-3\right).\left(\dfrac{2}{3}-\dfrac{5}{4}\right):\left(-7\right)\)
a)\(\dfrac{\dfrac{2}{3}-}{\dfrac{8}{3}-}\dfrac{\dfrac{2}{5}+}{\dfrac{8}{5}+}\dfrac{\dfrac{2}{7}-}{\dfrac{8}{7}-}\dfrac{\dfrac{2}{9}+}{\dfrac{8}{9}+}\dfrac{\dfrac{2}{11}}{\dfrac{8}{11}}\)
b)\(\left(\dfrac{1}{2}-1\right)\left(\dfrac{1}{3}-1\right)\left(\dfrac{1}{4}-1\right)...\left(\dfrac{1}{50}-1\right)\left(\dfrac{1}{51}-1\right)\)
1) Tính : a) \(\left(\dfrac{-5}{11}\right)\) .\(\dfrac{7}{15}\) . \(\left(\dfrac{11}{-5}\right)\) .(-30) b) \(\left(\dfrac{11}{12}:\dfrac{33}{16}\right)\). \(\dfrac{3}{5}\) c) \(\dfrac{-7}{15}\).\(\dfrac{5}{8}\).\(\dfrac{15}{-7}\). (-16) d) \(\left(-\dfrac{1}{2}\right)\). \(3\dfrac{1}{5}\)+ \(\left(-\dfrac{1}{2}\right)\).\(-2\dfrac{1}{5}\)
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
Tính :
a) \(\left(\dfrac{-2}{3}+\dfrac{3}{7}\right):\dfrac{4}{5}+\left(\dfrac{-1}{3}+\dfrac{4}{7}\right):\dfrac{4}{5}\)
b) \(\dfrac{5}{9}:\left(\dfrac{1}{11}-\dfrac{5}{22}\right)+\dfrac{5}{9}:\left(\dfrac{1}{15}-\dfrac{2}{3}\right).\)