bonjour
|+9| = |9| = 9 ; |-9| = 9
on enlève le signe
a) |4| + |-3| = 4 + 3 = 7 ( |-3| = 3 )
b)|1,2| - |-1,21| = 1,2 - 1,21 = -0,01 ( |-1,21| = 1,21 )
c) |5 - 8| - 3 = |-3| - 3 = 3 - 3 = 0
d) 2|4 - 10| + |7 - 5| = 2 x |4 - 10| + |7 - 5|
= 2 x |-6| + |2|
= 2 x 6 + 2
= 12 + 2
= 14
