Question

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

Answer 1

bài này tự almf

Answer 2

a) 119/240

b)1/6

c)2/17

d)-48/13

e)-520/7

Answer 3

a: \(=\dfrac{7}{8}\cdot\dfrac{10+24}{60}=\dfrac{7}{8}\cdot\dfrac{34}{60}=\dfrac{7}{8}\cdot\dfrac{17}{30}=\dfrac{119}{240}\)

b: \(=\dfrac{3}{2}-\dfrac{5}{6}:\dfrac{1}{4}+2=\dfrac{7}{2}-\dfrac{7}{3}=\dfrac{7}{6}\)

c: \(=\left(\dfrac{15}{34}+\dfrac{19}{34}\right)+\left(\dfrac{1}{3}+\dfrac{2}{3}\right)-1-\dfrac{15}{17}=1-\dfrac{15}{17}=\dfrac{2}{17}\)

d: \(=\left(-8\right)\cdot\dfrac{1}{2}:\left(\dfrac{9}{4}-\dfrac{7}{6}\right)\)

=-4:(27/12-14/12)

=-4:13/12=-4*12/13=-48/13

e: \(=\dfrac{-5}{3}\left(16+\dfrac{2}{7}+28+\dfrac{2}{7}\right)=\dfrac{-5}{3}\cdot\left(44+\dfrac{4}{7}\right)=-\dfrac{520}{7}\)