14 and one in two + 4 and 20:17 what is it? Sorry, it's subtraction!

14 and one in two + 4 and 20:17 what is it? Sorry, it's subtraction!

14*1/2-4*17/20
=29/2-97/20
=290/20-97/20
=193/20
=9 and 13 / 20

1. 5 + 12 1 / 2-4 1 / 4 = 2, 3 / 20 + 2.15-1 / 4 + 17.85=
3. 2 and 1 / 4-1.8=
4. 7.5-2 and 3 / 7=

1. 5.5 + 12 1 / 2-4 1 / 4
=18-4 and 1 / 4
=13 and 3 / 4
2. 3 / 20 + 2.15-1 / 4 + 17.85
=2.6+（17.85-0.25）
=2.6+17.6
=20.2
3. 2 and 1 / 4-1.8
=2.25-138
=0.45
4. 7.5-2 and 3 / 7
=7 and 1 / 2-2 and 3 / 7
=5 and 1 / 14

In the sequence 1, 1, 2, 3, 5, 8, x, 21, 34, 55, x equals ()
A. 11B. 12C. 13D. 14

∵ sequence 1, 1, 2, 3, 5, 8, x, 21, 34, 55 & nbsp; let {an} an = an-1 + An-2 & nbsp; (n > 3) ∵ x = A7 = A5 + A6 = 5 + 8 = 13, so choose C

In the sequence 1 1 2 3 5 8 x 21 34 55 Where x is equal to?

x=5+8=13