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Sagot :

Bonjour,

1)

2

2+7 = 9

2-9 = -7

-7* 9 = -63

2)

2

2*2 = 4

4-4 = 0

0 -63 = -63

3)

10

100

100 -20 = 80

80 -63 = 17

4)

10

17

10 - 9 = 1

1*17 = 17

5)

Programme 1

x

x+7

x-9

(x-9)( x+7) = x² +7x -9x -63 = x² -2x -63

Programme 2

x

x²

x²-2x

x² -2x -63

C'est vrai !

6)

x² -2x -63 =0

x² - 2x = 63

9² - (9*2) = 63

On prend 9

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