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101²52²1003² 98²79² Calculer sans poser dopération et sans calculatrice : 997² 99 10132 281003 997 105² - 95²52² - 48²31² - 29²

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Presentation on theme: "101²52²1003² 98²79² Calculer sans poser dopération et sans calculatrice : 997² 99 10132 281003 997 105² - 95²52² - 48²31² - 29²"— Presentation transcript:

1 101²52²1003² 98²79² Calculer sans poser dopération et sans calculatrice : 997² ² - 95²52² - 48²31² - 29²

2 (100+1)² 101² = = ² ² =

3 (50 + 2)² 52² = = ² ² = 2 704

4 (1000+3)² 1003² = = ² ² =

5 (100-2)² 98² = = ² ² = 9 604

6 (80 - 1)² 79² = = ² ² = 6 241

7 (1000-3)² 997² = = ² ² =

8 ( )( ) = 100² 1² = = 9 999

9 (30 + 2)(30 - 2) = 30² 2² = = 896

10 ( )( ) = 1000² 3² = =

11 105² - 95² = ( ) (105-95) = = 2000

12 52² - 48² = ( ) ( ) = = 400

13 31² - 29² = ( ) ( ) = 60 2 = 120

14


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