Sagot :
Bonjour,
a. 2 – 7 +5 – 4-9
= 2+5 -7-4-9
= -13
b. 2+3 - (5 – 9)
= 2+3-5+9
= 9
c. -2 + 9 - (3+7)
= -2+9-3-7
= -3
d . (3 + 2) + [3 - (4 - 7)] - 2
= 3+2+( 3-4+7) -2
= 3+2+3-4+7-2
= 15-6
= 9
Bonjour,
a. 2 – 7 +5 – 4-9
= 2+5 -7-4-9
= -13
b. 2+3 - (5 – 9)
= 2+3-5+9
= 9
c. -2 + 9 - (3+7)
= -2+9-3-7
= -3
d . (3 + 2) + [3 - (4 - 7)] - 2
= 3+2+( 3-4+7) -2
= 3+2+3-4+7-2
= 15-6
= 9