Question

tính:

a)13/15+4/7-101/105

b)2/5+3/5*4/9

c)3/4*5/2*7/6

d)1/2:1/4-1/6

e)2/3-1/4+2/9

g)5/2+1/3*3/2

Answer 1

a: \(=\dfrac{91}{105}+\dfrac{60}{105}-\dfrac{101}{105}=\dfrac{50}{105}=\dfrac{10}{21}\)

b: \(=\dfrac{2}{5}+\dfrac{12}{45}=\dfrac{30+12}{45}=\dfrac{42}{45}=\dfrac{14}{15}\)

c: \(=\dfrac{3}{4}\cdot\dfrac{5}{2}\cdot\dfrac{7}{6}=\dfrac{3}{6}\cdot35\cdot\dfrac{1}{8}=\dfrac{1}{16}\cdot35=\dfrac{35}{16}\)

d: \(=2-\dfrac{1}{6}=\dfrac{11}{6}\)

e: \(=\dfrac{24}{36}-\dfrac{9}{36}+\dfrac{8}{36}=\dfrac{25}{36}\)