| c) | Applique les produits remarquables pour calculer. |
|
1052
|
=
(100 + 5)2 = 1002 + 2 . 100 . 5 + 52 = 10000 + 1000 + 25 = 11025 |
|
412
|
=
(40 + 1)2 = 402 + 2 . 40 . 1 + 12 = 1600 + 80 + 1 = 1681 |
|
692
|
=
(70 – 1)2 = 702 – 2 . 70 . 1 + 12 = 4900 – 140 + 1 = 4761 |
|
39
. 41
|
=
(40 – 1) . (40 + 1) = 402 – 12 = 1600 – 1 = 1599 |
|
98
. 102
|
=
(100 – 2) . (100 + 2) = 1002 – 22 = 10000 – 4 = 9996 |
|
45
. 55
|
=
(50 – 5) . (50 + 5) = 502 – 52 = 2500 – 25 = 2475 |
|
57
. 63
|
=
(60 – 3) . (60 + 3) = 602 – 32 = 3600 – 9 = 3591 |