Question

1/2+1/3+1/4 =
1 2/5+3 4/10+2 1/2=

Answer 1

1/2 + 1/3 + 1/4 = 6/12 + 4/12 + 3/12 = 13/12 = 1 1/12

1 2/5 + 3 4/10 + 2 1/2 = 1 4/10 + 3 4/10 + 2 5/10 = 6 13/10 = 7 3/10

(4 1/3 - 2 2/5) - (6 3/5 - 5 2/3) = (4 5/15 - 2 6/15) - (6 3/5 - 5 2/3) = 1 14/15 - (6 9/15 - 5 10/15) = 1 14/15 - 14/15= 1

Answer 2

1/2+1/3+1/4=6/12+4/12+3/12= 13/12= 1 i 1/12

1 i 2/5+3 i 4/10+ 2 i 1/2=  1 i 4/10+ 3 i 4/10+ 2 i 5/10= 6 i 13/10= 7 i 3/10

( 4 i 1/3- 2 i 2/5)-( 6 i 3/5- 5 i 2/3)= ( 4 i 5/15- 2 i 6/15) -( 6 i 9/15- 5 i 10/15)=  ( 3 i20/15-2 i 6/15)-(5 i 24/15- 5 i 10/15)=  1 i 14/15-14/15= 1