Explicație pas cu pas:
1. a) 8/9 ; 3/5
(8×5)/(9×5) ; (3×9)/(5×9)
40/45 ; 27/45
b) 2/3 ; 1/4
(2×4)/(3×4) ; (1×3)/(4×3)
8/12 ; 3/12
c) 2/11 ; 7/4
(2×4)(11×4) ; (7×11)/(4×11)
8/44 ; 77/44
d) 1/2 ; 1/3 ; 1/4
(1×6)/(2×6) ; (1×4)/(3×4) ; (1×3)/(4×3)
6/12 ; 4/12 ; 3/12
e) 5/12 ; 11/4 ; 17/3
(5×1)/(12×1) ; (11×3)/(4×3) ; (17×4)/(3×4)
5/12 ; 33/12 ; 68/12
f) 2/35 ; 1/70 ; 3/140
(2×4)/(35×4) ; (1×2)/(70×2) ; (3×1)/(140×1)
8/140 ; 2/140 ; 3/140
