Réponse :
A= 10x _ 7
B= -3x _ 5
C= 18x* _ 28x _ 16
D= 5x* + 44x _ 60
E= 9x* _ 36x + 36
F= 15x _ 5x*
Explications étape par étape:
A= 4x _ 7 ( 2x + 1 )
= 4x _ 7×2x _7×1
= 4x _ 14x _ 7
= 10x _ 7
B= -( 7x + 3 ) + ( 4x _ 2 )
= -7x _ 3 + 4x _ 2
= -3x _ 5
C= ( 4 + 9x ) ( 2x _ 4 )
=4×2x _ 4×4 + 9x×2x _ 9x×4
=8x _ 16 + 18x* _ 36x
=18x* _ 28x _16
D = (5x _6 ) ( x + 10 )
=5x×x + 5x×10 _6×x _6×10
=5x* + 50x _ 6x _60
=5x* + 44x _ 60
E= (3x _ 6)*
= (3x )* _ 2×3x×6 + 6*
= 9x* _ 36x +36
F= 5x ( 3 _ x )
= 15x _5x*
