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multiplier et diviser des fractions

1) 3/5 x 4/6 = ?
2) 1/7 x 15/10 = ?
3) 5 x 1/3 = ?
4) 471 x 3/471 = ?
5) 12/5 x 25/6 = ?
6) 65/3 x 1/6 = ?
7) 42/15 x 1/3 = ?
8) 3/5 : 4/6 = ?
9) 1/7 : 15/10 = ?
10) 5 : 1/3 = ?
11) 471 : 3/471 = ?
12) 2/3 : 1/6 = ?
13) 60/7 : 49/3 = ?
14) 100/3 : 3/200 = ?
15) 2/3 x 5/4 : 1/12 = ?
16) 4/7 : 1/7 x 12/5 = ?
17) 65/4 : 3/102 x 4/121 = ?
18) 12/5 x 1/6 : 63/112 = ?
19) 261/2 x 5/42 : 4/11 = ?
20) 65/3 x 125/13 : 41/80 = ?
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