Calculer les expressions suivantes E = 7-2+3-4+12-5 F = −3+2-4,5+5-2,5 G=-8+3-7,5+3-2,5 H=6+3-4-2+5-11 I = -3,12 + 5,08 +3,12 K=6-5+4-3+2-1

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E= 7-2+3-4+12-5

= 7+3 +12-( 2+4+5)

= 22- 11

= 11

F = −3+2-4,5+5-2,5

= 2+5-( 3+4,5+2,5)

= 7 - 10

= -3

G=-8+3-7,5+3-2,5

= 3+3 - (8+7,5+2,5)

= 6 - 18

= - 12

H=6+3-4-2+5-11

= 6+3+5 -( 4+2+11)

= 15 - 16

= -1

I = -3,12 + 5,08 +3,12

= 5,08 +3,12 - 3,12

= 5,08

K=6-5+4-3+2-1

= 6+4+2 -( 5+3+1)

= 12 - 9

= 3