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Ex N°36 p. 72 A = (- 5) - (+ 7) - (- 3) + (+ 11) A = - 5 - 7 + 3 + 11 A = - 12 + 14 A = (- 5) + (- 7) + (+ 3) + (+ 11) A = 2 B = (+ 4) + (- 3) + (- 6) + (+ 2) B = 4 - 3 - 6 + 2 B = 6 - 9 B = - 3
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Ex N°37 p. 72 C = (- 2) + (- 1) - (+ 4) + (- 3) - (- 8) C = - 2 - 1 - 4 - 3 + 8 C = 8 - 10 C = -2 D = (+ 11) - (+ 3) + (- 4) - (+ 2) + (- 13) D = 11 – 3 – 4 – 2 – 13. D = 11 - 22 D = - 11 C = (- 2) + (- 1) + (- 4) + (- 3) + (+ 8) D = (+ 11) + (- 3) + (- 4) + (- 2) + (- 13)
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Ex N°38 p. 72 E = (- 28) - (- 32) + (- 25) + (+ 28) + (- 32) E = - 25 F = (+ 125) + (- 73) + (+ 40) - (- 73) - (+ 125) E = (- 28) + (+ 32) + (- 25) + (+ 28) + (- 32) F = (+ 125) + (- 73) + (+ 40) + (+ 73) + (- 125) F = 40
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Exercice N°39 p. 72 : Calculs avec parenthèses Ecritures simplifiées (- 6) + (+ 12) + (- 4) + (- 8) - 4 + 3 – 9 + 7 (+ 8) – (+ 6) + (- 2) – (- 9) 9 – 7 + 4 - 5 - 6 + 12 – 4 – 8 (- 4) + (+ 3) + (- 9) + (+ 7) 8 – 6 – 2 + 9 (+ 9) + (- 7) + (+ 4) + (- 5)
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A = - 4 - 8 B = + 3 - 8 C = - 2 + 7 D = 8 + 9 E = - 8 + 3 F = + 7 - 4 A = - 12B = - 5 C = 5D = 17 E = - 5 Exercice N°40 p. 72 : F = 3
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G = 6 – 9 + 4 H = - 6 + 9 - 4 I = 6 – 9 – 4 J = - 6 – 9 – 4 G = 10 - 9 Exercice N°41 p. 72 : G =1 H = - 10 + 9 H = - 1 I = - 3 – 4 I = - 7 J = - 19
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K = 15 + 7 – 12 + 18 L = - 9 + 3 – 4 + 7 M = + 18 + 12 – 9 + 11 N = 25 – 12 + 14 - 6 K = 22 + 6 Exercice N°42 p. 72 : K = 28 L = - 13 + 10 L = - 3 M = 30 + 2 M = 32 N = 19 + 2 N = 21
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P = - 45 + 39 + 45 – 63 - 39 Q = 37 – 69 + 23 + 69 - 37 R = - 50 + 29 – 11 + 30 + 20 S = 73 – 36 – 40 – 33 + 36 P = - 63 Exercice N°43 p. 72 : Q = 23 R = 18 S = 0
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a) - 6 – 4 = - 10 b) – 8 + 12 = 4 c) + 14 – 17 = - 3 d) + 17 - 11 = + 6 Exercice N°44 p. 72 :
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A = 15 – ( 7 – 3 ) B = - 24 + (- 7 – 4) C = - 18 – (- 12 + 8) D = 28 + (- 15 + 4) A = 15 - 4 Exercice N°45 p. 72 : A = 11 B = - 24 + (- 11) B = - 35 C = - 18 – (- 4) C = - 18 + (+ 4) D = 28 + (- 11) D = 17 C = - 14
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E = 17 – ( 8 – 28 ) F = - 9 + (- 17 + 8) G = 30 – (- 8 + 19) H = - 12 + (- 9 + 14) E = 17 – (- 20) Exercice N°46 p. 72 : E = 17 + (+ 20) F = - 9 + (- 9) F = - 18 G = 30 – (+ 11) G = 30 + (- 11) H = - 12 + (+ 5) H = - 7 G = 19 E = 37
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I = 13 – (6 – 9) + 7 J = - 8 – (7 + 4) - 8 K = (- 8 + 4 – 9) + (6 – 2 + 7) I = 20 – (- 3) Exercice N°47 p. 72 : I = 20 + (+ 3) J = - 8 – 11 – 8 J = - 27 K = (- 17 + 4) + (4 + 7) K = (-13) + 11 K = - 2 I = 23
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