bonjour
a = 11/3 - 8/3 : ( - 16/5)
a = 11/3 - 8/3 x - 5/16
a = 11/3 + 40/48
a = 176/48 + 40/48
a = 216/48 = 9/2
b = ( 1 - 2/3 + 9/7) : ( 4/5 - 1/3)
b = ( 21/21 - 14/21 + 27/21) : ( 12/15 - 5/15)
b = 31/21 : 7/15
b = 31/21 x 15/7
b = 465/147 = 155/49
c = 10 x 10 ³ x 10 ⁻¹⁰ sur 20
c = 10 ⁻⁶ sur 20
c = 5000 = 5 x 10 ³
