Répondre :
Bonjour ;
a)
- 3 + 7/3 x 9 = - 3 + 7 x 9/3 = - 3 + 7 x 3 = - 3 + 21 = 18 .
b)
(- 2/3 + 1/3) x 9/4 = (- 1/3) x 9/4 = - 1/3 x 9/4 = - 9/3 x 1/4 = - 3 x 1/4 = - 3/4 .
c)
2 - (2/3 + 5/6) = 2 - (4/6 + 5/6) = 2 - 9/6 = 2 - 3/2 = 4/2 - 3/2 = 1/2 .
d)
3 + 2/3 ÷ 1/3 = 3 + 2/3 x 3/1 = 3 + 2 = 5 .
e)
(5/3 + 4/3) ÷ (3/5 - 3/7) = 9/3 ÷ (3/5 - 3/7) = 3 ÷ (3 x (1/5 - 1/7))
= 1 ÷ (1/5 - 1/7) = 1 ÷ ((7 - 5)/35) = 1 ÷ 2/35 = 1 x 35/2 = 35/2 .
f)
On a : 1/4 + 5/2 x 3/45 = 1/4 + 5/45 x 3/2 = 1/4 + 1/9 x 3/2
= 1/4 + 3/9 x 1/2 = 1/4 + 1/3 x 1/2 = 1/4 + 1/6 = 3/12 + 2/12 = 5/12 .
On a aussi : 5/6 + 5/4 = 10/12 + 15/12 = 25/12 .
(1/4 + 5/2 x 3/45)/(5/6 + 5/4) = (5/12)/(25/12) = 5/12 x 12/25 = 5/25 = 1/5 .
a)
- 3 + 7/3 x 9 = - 3 + 7 x 9/3 = - 3 + 7 x 3 = - 3 + 21 = 18 .
b)
(- 2/3 + 1/3) x 9/4 = (- 1/3) x 9/4 = - 1/3 x 9/4 = - 9/3 x 1/4 = - 3 x 1/4 = - 3/4 .
c)
2 - (2/3 + 5/6) = 2 - (4/6 + 5/6) = 2 - 9/6 = 2 - 3/2 = 4/2 - 3/2 = 1/2 .
d)
3 + 2/3 ÷ 1/3 = 3 + 2/3 x 3/1 = 3 + 2 = 5 .
e)
(5/3 + 4/3) ÷ (3/5 - 3/7) = 9/3 ÷ (3/5 - 3/7) = 3 ÷ (3 x (1/5 - 1/7))
= 1 ÷ (1/5 - 1/7) = 1 ÷ ((7 - 5)/35) = 1 ÷ 2/35 = 1 x 35/2 = 35/2 .
f)
On a : 1/4 + 5/2 x 3/45 = 1/4 + 5/45 x 3/2 = 1/4 + 1/9 x 3/2
= 1/4 + 3/9 x 1/2 = 1/4 + 1/3 x 1/2 = 1/4 + 1/6 = 3/12 + 2/12 = 5/12 .
On a aussi : 5/6 + 5/4 = 10/12 + 15/12 = 25/12 .
(1/4 + 5/2 x 3/45)/(5/6 + 5/4) = (5/12)/(25/12) = 5/12 x 12/25 = 5/25 = 1/5 .
bonjour
Exercice 1)/_
a) -3+7/3×9=-3+7×3=-3+21=18
b) (-2/3+1/3)×9/4=-1/3×9/4=-3/4
c) 2-(2/3+5/6)=2-(4+5/6)=2-9/6=2-3/2=(4-3/2)=1/2
d) 3+2/3÷1/3=3+2/3×3=3+6/3=3+2=5
e) (5/3+4/3)÷(3/5-3/7)=9/3÷(21-15/35)=3÷(6/35)
=3×35/6=35/2
f) (1/4+5/2×3/45)/5/6+5/4=
(1/4+3/18)/20+30/24
=(1/4+1/6)×24/50
=10/24×24/50=10/50=1/5
Exercice 1)/_
a) -3+7/3×9=-3+7×3=-3+21=18
b) (-2/3+1/3)×9/4=-1/3×9/4=-3/4
c) 2-(2/3+5/6)=2-(4+5/6)=2-9/6=2-3/2=(4-3/2)=1/2
d) 3+2/3÷1/3=3+2/3×3=3+6/3=3+2=5
e) (5/3+4/3)÷(3/5-3/7)=9/3÷(21-15/35)=3÷(6/35)
=3×35/6=35/2
f) (1/4+5/2×3/45)/5/6+5/4=
(1/4+3/18)/20+30/24
=(1/4+1/6)×24/50
=10/24×24/50=10/50=1/5
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