A = 2 X 5x   +4 X 2x B= 5 X 5x  -6 X 2x

A = 2 X 5x +4 X 2x a = 10x +8x
a = 18x

B= 5 X 5x -6 X 2x
b = 25x -12x
b = 13x

Bonjour,

A=2*5x+4*2x
=10x+4*2x
=10x+8x
=18x

B=5*5x-6*2x
=25x-6*2x
=25x-12x
=13x

(les * sont des fois)