| b) | Transforme les différences en sommes, puis calcule. |
| (–
4) – (– 7) = |
–
4 + 7 |
=
3 |
(+215)
– (– 55) = |
(+
215) + (+ 55) |
= 270 |
| (+5)
– (+6) = |
(+
5) + (– 6) |
= – 1 |
(–
105) – (+725) = |
(–
105) + (– 725) |
= – 830 |
| (–
4) – (– 8) = |
(–
4) + (+ 8) |
= 4 |
(+351)
– (– 415) = |
(+
351) + (+ 415) |
= 766 |
| (+5)
– (– 9) = |
(+
5) + (+ 9) |
=
14 |
(–
273) – (+322) = |
(–
273) + (– 322) |
= – 595 |
| (–
8) – (+7) = |
(–
8) + (– 7) |
=
– 15 |
(+356)
– (– 215) = |
(+
356) + (+ 215) |
= 571 |