a) 7/3 + 1/2 - - 3/70
= 7/3 + 1/2 + 3/70
= 490/210 + 105/210 + 9/210
= 604/210
= 302/105
b) 5/12 - 3/-16 + 3/4
= 5/12 - -3/16 + 3/4
= 5/12 + 3/16 + 3/4
= 20/48 + 9/48 + 36/48
= 65/48
#Chúc cậu học tốt nè :>
a)\(\dfrac{7}{3}+\dfrac{1}{2}--\dfrac{3}{70}\)
\(=\dfrac{17}{6}+\dfrac{3}{70}\)
\(=\dfrac{302}{105}\)
b)\(\dfrac{5}{12}-\dfrac{-3}{16}+\dfrac{3}{4}\)
\(=\dfrac{5}{12}+\dfrac{3}{16}+\dfrac{3}{4}\)
\(=\dfrac{29}{48}+\dfrac{3}{4}\)
\(=\dfrac{65}{48}\)