Question

Tính

a.\(\dfrac{4}{9}+\dfrac{3}{7}\)    \(\dfrac{3}{4}+\dfrac{7}{24}\)   \(\dfrac{1}{3}+\dfrac{2}{9}+\dfrac{4}{27}\)

b.\(\dfrac{5}{6}-\dfrac{3}{8}\)     \(\dfrac{7}{15}-\dfrac{11}{30}\)    \(\dfrac{2}{3}+\dfrac{1}{6}-\dfrac{7}{12}\)

c.\(\dfrac{18}{25}\times\dfrac{15}{6}\)    \(\dfrac{30}{49}:\dfrac{6}{7}\)      \(\dfrac{1}{2}\times\dfrac{3}{4}:\dfrac{6}{5}\)

d.\(8\times\dfrac{3}{5}:\dfrac{12}{5}\)     \(4:\dfrac{9}{5}:\dfrac{10}{3}\)

3 bn đầu tiên xong mik sẽ tick

Answer 1

a: 4/9+3/7=28/63+27/63=55/63

3/4+7/24=18/24+7/24=25/24

1/3+2/9+4/27=9/27+6/27+4/27=19/27

b: 5/6-3/8=20/24-9/24=11/24

7/15-11/30=14/30-11/30=3/30=1/10

2/3+1/6-7/12

=8/12+2/12-7/12

=3/12=1/4

c: 18/25*15/6=15/25*18/6=3*3/5=9/5

30/49:6/7=30/49*7/6=210/294=5/7

1/2*3/4:6/5=3/8*5/6=15/48=5/16

d: 8*3/5:12/5=24/5*5/12=2

4:9/5:10/3=4*5/9*3/10=2/3