Question

mình cần gấp nhé mai mình nộp bài rồi

tính nhanh nha

a)90/108-40/72

b)7/3/8+5/1/4

c)25/2-18/13+5/13

d)17/13-(25/100+4/13)

Answer 1

\(a,\dfrac{90}{108}-\dfrac{40}{72}=\dfrac{5}{6}-\dfrac{5}{9}=\dfrac{30}{36}-\dfrac{20}{36}=\dfrac{10}{36}=\dfrac{5}{18}\)

\(b,\dfrac{59}{8}+\dfrac{21}{4}=\dfrac{59}{8}+\dfrac{42}{8}=\dfrac{101}{8}\)

\(c,\dfrac{25}{2}-\dfrac{18}{13}+\dfrac{5}{13}=\dfrac{325}{26}-\dfrac{26}{26}+\dfrac{10}{26}=\dfrac{309}{26}\)

\(d,\dfrac{17}{13}-\left(\dfrac{25}{100}+\dfrac{4}{13}\right)=\dfrac{17}{13}-\dfrac{29}{52}=\dfrac{3}{4}\)

Answer 2

a) \(\dfrac{90}{108}-\dfrac{40}{72}\)

\(=\dfrac{5}{6}-\dfrac{5}{6}\)

\(=0\)