SVP,AIDEZ MOI A FAIRE CA. URGENT MERCI BEAUCOUP

Exercice - 51 :

A = 2 / 3 + 5 / 3 x 4 / 7
= 2 / 3 + 20 / 21
= 14 / 21 + 20 / 21
= 34 / 21

B = 1 / 5 - 7 / 5 x 2 / 3
= 1 / 5 - 14 / 15
= 3 / 15 - 14 / 15
= - 11 / 15

C = 7 / 30 - 4 / 3 : 5 / 2
= 7 / 30 - 4 / 3 x 2 / 5
= 7 / 30 - 8 / 15
= 7 / 30 - 16 / 30
= - 9 / 30
= - 3 / 10

D = ( 4 - 1 / 3 ) + 5 / 4
= 11 / 3 + 5 / 4
= 44 / 12 + 15 / 12
= 59 / 12

Exercice - 47 :

G = 3^5 x 10^6 x 3^-5 x 10^3 / ( 3² )^-3 x ( 10^4 )^-3
= 243 x 1 000 000 x 1 / 243 x 1 000

je te fini demain ;)

bonsoir

A = 2/3 + 5/3 x 4/7
a = 2/3 + 20/21
a = 14/21 + 20/21 = 34/21 

b = 1/5 - 14/15
b = 3/15 - 14/15
b = - 11/15

c = 7/30 - 4/30 x 2/5
c = 7/30 - 8/150
c = 35/150 - 8/150 = 37/150

d = ( 12/3 - 1/3) + 5/4
d = 11/3 + 5/4
d = 44/12 + 15/12
d = 59/12

g = 3 ⁰ x 10⁹ sur 3⁻⁶ x 10 ⁻¹²
G = 3 ⁶  x 10 ²¹ 
G = 729 x 10²¹ 

H = 7⁵ x 7 ⁸ x 10 ⁻⁷ x 10 ⁻⁶ sur 7 ¹¹ x 10⁻⁹
H = 7 ¹³ x 10 ⁻¹³ sur 7 ¹¹ x 10 ⁻⁹
H = 7 ² x 10⁻⁴
H = 49 x 10⁻⁴ = 0,0049