Question

Answer 1

Bài 7:

a: \(=\dfrac{21}{47}+\dfrac{26}{47}+\dfrac{1}{5}+\dfrac{4}{5}=1+1=2\)

b: \(=\dfrac{15}{12}-\dfrac{3}{12}+\dfrac{5}{13}-\dfrac{18}{13}=1-1=0\)

c; \(=\dfrac{13}{25}-\dfrac{38}{25}+\dfrac{6}{41}+\dfrac{35}{41}-\dfrac{1}{2}=-1+1-\dfrac{1}{2}=-\dfrac{1}{2}\)

d: \(=12\cdot\dfrac{4}{9}+\dfrac{4}{3}=\dfrac{16}{3}+\dfrac{4}{3}=\dfrac{20}{3}\)

e: \(=-\dfrac{5}{7}\left(12.5+1.5\right)=-\dfrac{5}{7}\cdot14=-10\)

f: \(=\dfrac{4}{5}\cdot\left(\dfrac{14}{4}+\dfrac{1}{4}\right)^2=\dfrac{4}{5}\cdot\dfrac{225}{16}=\dfrac{15}{4}\)