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Sagot :

AYUDA

bjr

0 + x =

je rajoute 0 à x donc ? = x

1 + x = x + 1

0 * x = 0 fois qqch = 0... si, si..

1*x = x

x+x = 1 chou + 1 chou = 2 choux = 2x

x*x = x²

x - x + x = x (1 chou - 1 chou + 1 chou = 1 chou)...

x² * 1 = x²    (1 fois qqch = qqch)..

x*x*x = x³

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