bonjour
A = 2 x 4.2 - 0.2 + ( - 3 + 1 )
⇔ 8.4 - 0.2 + ( - 2 )
⇔ 8.4 - 0.2 - 2
⇔ = 6.2
B = - 12.4 - 2.4 : 8 + ( - 3.6 + 4.7)
⇔ - 12.4 - 0.3 + 1.1
⇔ = - 11.6
C = - 2/3 - 3 /7 x 4/3
⇔ - 2/3 - 12/21
⇔ - 14/21 - 12/21
⇔ - 26/21
D = - 2 /9 + 5/6 : 5/2
⇔ - 2/9 + 5/6 * 2/5
⇔ - 2/9 + 10/30
⇔ - 2/9 + 1/3
⇔ - 2/9 + 3/9
⇔ = 1/9
