Răspuns:
Explicație pas cu pas:
a) 2 supra 3 + 4 supra 5 - 1 supra 3
2/3 + 4/5 - 1/3 = 1/3 + 4/5 = 5/15 + 12/15 = 17/15
b) 1 supra 2 + 2 supra 4 - 1 supra 8
1/2 + 2/4 - 1/8 = 4/8 + 4/8 - 1/8 = 7/8
c) 1 supra 3 + 2 supra 6 - 1 supra 12
1/3 + 2/6 - 1/12 = 1/3 + 1/3 - 1/12 = 2/3 - 1/12 = 8/12 - 1/12 = 7/12
d) 5 supra 1 + supra 8
incomplet; ? supra 8
e) 3 supra 2 - 1 supra 5 + 1 supra 10
3/2 - 1/5 + 1/10 = 15/10 - 2/10 + 1/10 = 14/10 = 7/5
f) 3 supra 2 • (3 supra 2 - 1 supra 4) : 1 supra 4
3/2 * (3/2 - 1/4) : 1/4
= 3/2*(6/4 - 1/4) : 1/4 = 3/2 * 5/4 *4/1 = 15/2
