1.
a) 13-7=6
b) 1/7 ; 2/7 ; 3/7 ; 4/7 ; 5/7 ; 6/7 ; 7/7
c) numere prime: 2,3,5
2/1 ; 3/1 ; 3/2 ; 5/1 ; 5/2 ; 5/3 ; 5/4
d) 11 x 3033 = 33 x 1101
33363 = 36333 (F)
2. x = 2,4,5
3.
a) 360/250 = 36/25
b) x/5 = 7/y
x • y = 5 • 7
x • y = 35
2xy + 7
2 • 35 + 7
70 + 7
77
c) 27/x = 81/96
x • 81 = 27 • 96
x • 81 = 2590
x = 2590 : 81
x = 32
