b)
Calcule
en supprimant d'abord les parenthèses. |
1000
– (100 + 17) |
=
1000 – 100 – 17 = 900 – 17 = 883 |
1000
– (17 + 100) |
=
1000 – 17 – 100 = 983 – 100 = 883 |
1000
– (100 – 12) |
=
1000 – 100 + 12 = 900 + 12 = 912 |
1000
– (–12 + 100) |
=
1000 + 12 – 100 = 1012 – 100 = 912 |