Bonjour réduire les sommes
A = 3x X ( - 2x)
B = 5 X ( - 8a ) X (- 1)
c = 5x X ( - 2x ) X 7
A = 3x X ( - 2x)
B = 5 X ( - 8a ) X (- 1)
c = 5x X ( - 2x ) X 7
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= -6x X x
= -6x au carrée
2) 5 x ( -8a ) X ( -1 )
= ( -5 ) X -8a
= 40a
3) 5x X ( -2x ) X 7
= -10x X x X 7
= -10 au carrée X 7
= -70x au carrée