Réponse:
diviser un nombre c'est multiplier par son inverse donc :
a.
2/3 ÷ 5 = 2/3 ×1/5 = 2/15
b.
-5/7 ÷ (-4) = -5/7 × 1/-4 = -5/-28 = 5/28
c.
5/6 ÷ 7/-11 = 5/6 × -11/7 = -55/42
d.
8 ÷ 1/8 = 8 × 8 = 64
e.
-3/2 ÷ -5/7 = -3/2 × 7/-5 = -21/-10 = 21/10
f.
1/10 ÷ (-7/9) = 1/10 × 9/-7 = 9/-70
g.
8/-15 ÷ -4/5 = 8/-15 × 5/-4 = 40/60 = 2/3
h.
9/10 ÷ (-3) = 9/10 × 1/-3 = 9/-30 = 3/-10
i.
-4/45 ÷ 16/15 = -4/45 × 15/16 = -60/720 = 1/12
j.
-5/6 ÷ (-15/18) = -5/6 × 18/-15 = -90/-90 = 1
k.
12 ÷ 3/-4 = 12 × -4/3 = -48/3
l.
1 ÷ (-7/4) = 1 × 4/-7 = 4/-7
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Réponse:
diviser un nombre c'est multiplier par son inverse donc :
a.
2/3 ÷ 5 = 2/3 ×1/5 = 2/15
b.
-5/7 ÷ (-4) = -5/7 × 1/-4 = -5/-28 = 5/28
c.
5/6 ÷ 7/-11 = 5/6 × -11/7 = -55/42
d.
8 ÷ 1/8 = 8 × 8 = 64
e.
-3/2 ÷ -5/7 = -3/2 × 7/-5 = -21/-10 = 21/10
f.
1/10 ÷ (-7/9) = 1/10 × 9/-7 = 9/-70
g.
8/-15 ÷ -4/5 = 8/-15 × 5/-4 = 40/60 = 2/3
h.
9/10 ÷ (-3) = 9/10 × 1/-3 = 9/-30 = 3/-10
i.
-4/45 ÷ 16/15 = -4/45 × 15/16 = -60/720 = 1/12
j.
-5/6 ÷ (-15/18) = -5/6 × 18/-15 = -90/-90 = 1
k.
12 ÷ 3/-4 = 12 × -4/3 = -48/3
l.
1 ÷ (-7/4) = 1 × 4/-7 = 4/-7