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Ch02 19

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Ch02 19

  1. 1. Exercice 19 (a) 1 1 30 + (5 − 10) − 30 − 5 − 5 = 5 6 6 1 1 25 − 5− = 5 = 5 = 25 − 1 · 1 = 24 · 1 4 = 6 6 5 6 5 6 5
  2. 2. Exercice 19 (suite..) (b) 4 3 13 2 50 1− − + + 7−4 5+ + 5 6 10 3 3 30 − 24 − 15 + 39 17 50 = + 7−4 + 30 3 3 30 21 − 4(17) + 50 = + 30 3 3 = 1+ = 1+ 1=1+1=2 3 (c) 1 − 5 + 5(1 − 5) = 1 − 5 + 5 − 5 · 5 = 6 − 6 5 = 6(1 − 5)
  3. 3. Exercice 19 (suite..) (d) 2 − [−2 16(−2 + 5 9)] − 6 = 2 − [−2(4)(−2 + 5(3)] − 6 = 2 − [−2(4)(−2 + 15)] − 6 = 2 − [−2(4)(13)] − 6 = 2 − [−104] − 6 = 2 + 104 − 6 = 100 = 10

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