Question

kết quả của phép tính
(7/15 - 3/14 +1/5) - (-31/14 + 22/15)
A. 1/5
b. 6/5
C. 1
D. 0

Answer 1

B

Answer 2

B

Answer 3

b

Answer 4

B

Answer 5

\(\left(\dfrac{7}{15}-\dfrac{3}{14}+\dfrac{1}{5}\right)-\left(\dfrac{-31}{14}+\dfrac{22}{15}\right)\\ =\dfrac{7}{15}-\dfrac{3}{14}+\dfrac{1}{5}+\dfrac{31}{14}-\dfrac{22}{15}\\ =\left(\dfrac{7}{15}-\dfrac{22}{15}\right)-\left(\dfrac{3}{14}-\dfrac{31}{14}\right)+\dfrac{1}{5}\\ =\dfrac{-15}{15}-\dfrac{-28}{14}+\dfrac{1}{5}\\ =\left(-1\right)-\left(-2\right)+\dfrac{1}{5}\\ =\dfrac{6}{5}\\ \Rightarrow B\)

Answer 6

B

Answer 7

B

Answer 8

6/5