Thực hiện phép tính :

a. 13/6 + -1/6 b. (-8,5) + 16,35 + (-4,5). c. 3/5 . 11/7 + 3/5. (-4/7) + 2/5

Đáp án:

$a) \dfrac{13}{6}+\dfrac{-1}{6}= \dfrac{13-1}{6}= \dfrac{12}{6}=2$

$b) (-8,5)+16,35+(-4,5)$

$= [(-8,5)+(-4,5)]+16,35$

$= (-13)+16,35$

$= 3,35$

$c) \dfrac{3}{5}.\dfrac{11}{7}+\dfrac{3}{5}.\dfrac{-4}{7}+\dfrac{2}{5}$

$= \dfrac{3}{5}.(\dfrac{11}{7}+\dfrac{-4}{7})+\dfrac{2}{5}$

$= \dfrac{3}{5}.1+\dfrac{2}{5}$

$= \dfrac{3}{5}+\dfrac{2}{5}$

$= \dfrac{3+2}{5}$

$=1$