Mk sẽ lm chi tiết hơn cho bn hiểu và sau này sẽ lm tốt hơn những bài toán như thế này, xem cách lm của mk nhé!!!
a) \(\dfrac{5}{22}\)+\(\dfrac{3}{13}\)-\(\dfrac{1}{2}\)= \(\dfrac{5.13}{22.13}\)+\(\dfrac{3.22}{13.22}\)-\(\dfrac{1.143}{2.143}\)
= \(\dfrac{65}{286}\)+\(\dfrac{66}{286}\)-\(\dfrac{143}{286}\)
= \(\dfrac{65+66-143}{286}\)
= \(\dfrac{-12}{286}\)
= \(\dfrac{-6}{143}\)
b) \(\dfrac{4}{13}\)-\(\dfrac{2}{11}\)+\(\dfrac{3}{2}\) = \(\dfrac{4.22}{13.22}\)- \(\dfrac{2.26}{11.26}\)+\(\dfrac{3.143}{2.143}\)
= \(\dfrac{88}{286}\)-\(\dfrac{52}{286}\)+\(\dfrac{429}{286}\)
= \(\dfrac{88-52+429}{286}\)
= \(\dfrac{465}{286}\)
Chúc bn hk tốt !!!( Nếu bn đọc mà hiểu đk thì tick cho mk nha 
)
\(\dfrac{5}{22}+\dfrac{3}{13}-\dfrac{1}{2}=-\dfrac{6}{143}\)
\(\dfrac{4}{13}-\dfrac{2}{11}+\dfrac{3}{2}=\dfrac{465}{286}\)
\(=\dfrac{5}{22}-\dfrac{1}{2}+\dfrac{3}{13}=\dfrac{5}{22}-\dfrac{11}{22}+\dfrac{3}{13}\)
\(=\dfrac{-6}{22}+\dfrac{3}{13}=...\)tự tinh
