Răspuns:
Explicație pas cu pas:
a)
35/15 + 55/18 - 25/6 = 7/3 + 55/18 - 25/6 = 42/18 + 55/18 - 75/18 = 22/18 = 11/9
b)
10/16 + 21/15 - 3/30 - 15/100 = 5/8 + 7/5 - 1/10 - 3/20
= 25/40 + 56/40 - 4/40 - 6/40 = 71/40
c)
16/36 + 49/21 - 6/36 - 7/30 = 4/9 + 7/3 - 1/6 - 7/30
= 40/90 + 210/90 - 15/90 - 21/90 = 214/90 = 107/45
d)
35/120 + 21/27 - 25/90 = 7/24 + 7/9 - 5/18 = 21/72 + 56/72 - 20/72 = 57/72 = 19/24
e)
5/13 + 16/26 + 7/9 - 12/27 - 5/6 = 5/13 + 8/13 + 7/9 - 4/9 - 5/6
= 13/13 + 3/9 - 5/6 = 1 + 1/3 - 5/6 = 6/6 + 2/6 - 5/6 = 3/6 = 1/2
f)
3/20 + 5/30 - 17/60 = 3/20 + 1/6 - 17/60 = 9/60 + 10/60 - 17/60 = 2/90 = 1/45
g)
6/5 + 9/8 + 3/20 - 9/4 = 48/40 + 45/40 + 6/40 - 90/40 = 9/40
h)
5/71 + 132/142 + 6/4 - 2 = 5/71 + 66/71 + 3/2 - 2 = 71/71 + 3/2 - 2
= 1 + 3/2 - 2 = 3/2 - 1 = 3/2 - 2/2 = 1/2
i)
4 - 3/5 + 9/10 - 3/2 = 40/10 - 6/10 + 9/10 - 15/10 = 28/10 = 14/5
