Răspuns:
/ supra
|× inmultit cu...
a) 8/9 |×7, 9/7 |×9;
56/63, 81/63
b) 3/4 |×21, 5/7 |×12, 8/3 |×28
63/84, 60/84, 224/84
c) 3/11 |×4, 9/4 |×11
12/44, 99/44
d) 4/5 |×42, 6/7 |×30, 5/6 |×35
168/210, 180/210, 175/210
e) 5/12 |×4, 11/8 |×6, 17/48 |×1
20/48, 66/48, 17/48
f) 2/35 |×4, 1/70 |×2, 3/140 |×1
8/140, 2/140, 3/140
g) 9/13 |×8, 15/104 |×1, 23/52 |×2
72/104, 15/104, 46/104
h) 5/62 |×5, 13/31 |×10, 9/155 |×2
25/310, 130/310, 18/310
i) 7/15 |×15, 41/225 |×1, 19/75 |×3
105/225, 41/225, 57/225
j) 3/32 |×15, 7/24 |×20, 11/40 |×12, 7/48 |×10
45/480, 140/480, 132/480, 70/480
k) 5/12 |×9, 1/54 |×2, 7/36 |×3
45/108, 2/108, 21/108
l) 2/15 |×24, 1/72 |×5, 5/24 |×15
48/360, 5/360, 75/360
m) 3/25 |×18, 7/18 |×25, 1/75 |×6
54/450, 175/450, 6/450
n) 7/60 |×6, 1/72 |×5, 5/24 |×15
42/360, 5/360, 75/360
o) 1/441 |×8, 1/168 |×21, 5/98 |×36
8/3528, 21/3528, 180/3528
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