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moi69
@moi69
June 2021
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développer puis reduire svp 100000000000000fois ...... aidez-moi
a-(x+4)(x+2) b-(x+2)(0,5+x)
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Cabé
A = (x+4)(x+2)
A = x
²
+ 4x + 2x + 8
A = x
²
+ 6x + 8
B = (x+2)(0,5+x)
B = 0,5x + 1 + x
²
+ 2x
B = x
²
+ 2,5x + 1
0 votes
Thanks 1
MrEagle
a) ( x + 4 ) ( x + 2 )
= x* x + x * 2 + 4 * x + 4 * 2
= x^2 + 2x + 4x + 8
= x^2 + 6x + 8
b) ( x + 2 ) ( 0,5 + x )
= x* 0,5 + x * x + 2 * 0,5 + 2 * x
= 0,5x + x^2 + 1 + 2x
= x^2 + 2,5x + 1
0 votes
Thanks 1
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A = x² + 4x + 2x + 8
A = x² + 6x + 8
B = (x+2)(0,5+x)
B = 0,5x + 1 + x² + 2x
B = x² + 2,5x + 1
= x* x + x * 2 + 4 * x + 4 * 2
= x^2 + 2x + 4x + 8
= x^2 + 6x + 8
b) ( x + 2 ) ( 0,5 + x )
= x* 0,5 + x * x + 2 * 0,5 + 2 * x
= 0,5x + x^2 + 1 + 2x
= x^2 + 2,5x + 1