bonjour
A = 5 x 10 ⁴ x 7 x ( 10 ⁻²)³ sur 15 x 10 ⁻⁵
A = 35 x 10 ⁴ x 10 ⁻⁶ sur 15 x 10 ⁻⁵
A = 35 x 10 ⁻² sur 15 x 10 ⁻⁵
A = 35/15 x 10 ³
A = 7 /3 x 10 ³
A = ≅ 2.33 x 10 ³ ≅ 2330
B = 9/5 - 3/4 x 7
B = 9 /5 - 21/4
B = 36/20 - 105/20
B = - 69/ 20
C = 6/5 : ( 1/15 - 1 /5 )
C = 6/5 : ( 1/15 - 3 /15)
C = 6/5 : ( - 2 /15 )
C = 6/5 x - 15/2
C = - 90/10 = - 9
