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Sagot :

Bonjour

7(x+4)=  7x + 28

3x(x+12)=  3x² + 36x

10(2x+4)=  20x + 40

2x(3x+2x)=  6x² + 4x² = 10x²

7a(2a+1)=  14a² + 7a

25y(-2+6)= - 50y + 150y = 100y.

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