1/4+1/2+1/8=? 1/6 multiplié par (4/5+8/5) =? (5/2+5/4) multiplié par 4/15=?

1/4 + 1/2 + 1/8= 1 x 2 / 4 x 2 + 1 x 4 / 2 x 4 + 1/8
= 2/8 + 4/8 + 1/8
= 7/8

1/6 x (4/5 + 8/5)
= 1/6 x 12/5
= 12/30
= 6 x 2 / 6 x 5
= 2/5

(5/2 + 5/4) x 4/15
= (5 x 2 / 2 x 2 + 5/4) x 4/15
= (10/4 + 5/4) x 4/15
= 15/4 x 4/15
= 60/60
= 1

1/4 + 1/2 + 1/8 =
2/8 + 4/8 + 1/8 = 7/8

(5/2 + 5/4) X 4/15
10/4 +5/4 X 4/15
15/4 X 4/15
60/60 = 1