Question

1 . Tính

a) 2 / 3 x 3 / 4 x 4 / 5 : 1 / 5 

b) 1 x 2 x 3 x 4 trên 5 x 6 x 7 x 8 

c) 2 / 5 x 3 / 4 x 5 / 6 : 3 / 4 

 

Answer 1

\(\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}:\frac{1}{5}\)

\(=\frac{1}{2}\times\frac{4}{5}:\frac{1}{5}\)

\(=\frac{2}{5}:\frac{1}{5}\)

\(=2\)

Answer 2

a) 2/3 x 3/4 x 4/5 : 1/5

= 1/2 x 4

= 2

b) 1 x 2 x 3 x 4/5 x 6 x 7 x 8

= 2 x 3 x 24/5 x 56

= 6 x 72/5 x 56

= 432/5 x 56

= 24192/5

c) 2/5 x 3/4 x 5/6 : 3/4

= 3/10 x 10/9

= 1/3

Answer 3

a) 2/3 x 3/4 x 4/5 : 1/5
= 1/2 x 4
= 2
b) 1 x 2 x 3 x 4/5 x 6 x 7 x 8
= 2 x 3 x 24/5 x 56
= 6 x 72/5 x 56
= 432/5 x 56
= 24192/5
c) 2/5 x 3/4 x 5/6 : 3/4
= 3/10 x 10/9
= 1/3