Question
Applique les régle de divisions simplifie puis effectue les calculs donne les résultat sous la forme d'une fractions irréductible
a : 8/-15 ÷ -4/5
b : 9/10 ÷ ( -3 )
c : -4/45 ÷ 16/15
d : -5/6 ÷ ( - le moins est au millieu 15/18)
e 12 ÷ 3/-4
f 1 ÷ (-7/4)
a : 8/-15 ÷ -4/5
b : 9/10 ÷ ( -3 )
c : -4/45 ÷ 16/15
d : -5/6 ÷ ( - le moins est au millieu 15/18)
e 12 ÷ 3/-4
f 1 ÷ (-7/4)
Asked by: USER8766
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Answer (289)
a : 8/-15 ÷ -4/5
= - 8/15 x - 5/4
= 40/60
= 20 x 2 / 20 x 3
= 2/3
b : 9/10 ÷ ( -3 )
= 9/10 x - 1/3
= - 9/30
= 3 x - 3 / 3 x 10
= - 3/10
c : -4/45 ÷ 16/15
= - 4/45 x 15/16
= - 60/720
= 60 x - 1 / 60 x 12
= - 1/12
d : -5/6 ÷ (15/- 18)
= - 5/6 x - 18/15
= 90/90
= 1
e 12 ÷ 3/-4
= 12 x - 4/3
= - 48/3
= 3 x - 16 / 3 x 1
= - 16
f 1 ÷ (-7/4)
= 1 x - 4/7
= - 4/7
= - 8/15 x - 5/4
= 40/60
= 20 x 2 / 20 x 3
= 2/3
b : 9/10 ÷ ( -3 )
= 9/10 x - 1/3
= - 9/30
= 3 x - 3 / 3 x 10
= - 3/10
c : -4/45 ÷ 16/15
= - 4/45 x 15/16
= - 60/720
= 60 x - 1 / 60 x 12
= - 1/12
d : -5/6 ÷ (15/- 18)
= - 5/6 x - 18/15
= 90/90
= 1
e 12 ÷ 3/-4
= 12 x - 4/3
= - 48/3
= 3 x - 16 / 3 x 1
= - 16
f 1 ÷ (-7/4)
= 1 x - 4/7
= - 4/7