Question

a) 1/2 + 1/3 + 1/6

b) 1/2 - 1/3 - 1/6

c) 1/2 x 2/3 x 3/4

d) 1/2 : 2/3 : 3/4

Answer 1

a) \(\frac{1}{2}+\frac{1}{3}+\frac{1}{6}=\frac{3}{6}+\frac{2}{6}+\frac{1}{6}=1\)

b) \(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}=\frac{3}{6}-\frac{2}{6}-\frac{1}{6}=0\)

c) \(\frac{1}{2}.\frac{2}{3}.\frac{3}{4}=\frac{1}{4}\)

d) \(\frac{1}{2}:\frac{2}{3}:\frac{3}{4}=\frac{1}{2}.\frac{3}{2}.\frac{4}{3}=1\)

Chú ý : Dấu \(.\)là  dấu x nha

Answer 2

a) 1/2 + 1/3 + 1/6

= 3/6 + 2/6 + 1/6

=1

b) 1/2 - 1/3 - 1/6

= 3/6 - 2/6 - 1/6

= 0 

c) 1/2 x 2/3 x 3/4

= 1 x 2 x 3 /2 x 3 x4

= 1/4

d) 1/2 : 2/3 : 3/4

= 1/2 x 3/2 : 3/4

= 3/4 : 3/4

= 1