R´eponses du devoir de Math´ematiques n

R´eponses du devoir de Math´ematiques n

1

Sujet Droit Exercice 1

1. 1,036 2. 24,32%

3. 11,5%

4. 28,1%

Exercice 2

1. 298×(1 + 26

100) = 375,5 2. 143,3×133,2

100 = 190,9 3.

243 166,7

¹₃

−1 = 13%

4. 243×(1 + 13

100) = 275,5

Exercice 3 1. 525

1500 = 35%

2. 156

1500 = 10,4%

3. 48

195 = 24,6%

4. 156 + 171

525 = 62,3%

Exercice 4

1. 56628−68839

68839 =−17,8%

2. (a) a=

56628 60196

¹/7

= 0,991 (b) 0,991−1 =−0,9%

3. 56628×0,99⁴ = 54396

Exercice 5

1.

1− 30

100

1 5

−1 =−6,89%

2. (a)

1− 5

100 1− 1

100 1− 3 100

−1 =−9%

(b) 0,7

0,91 −1 =−23%

(c)

1− 23 100

1 2

−1 =−12%

Sujet Gauche Exercice 1

1. 1,043 2. 35,59%

3. 16,4%

4. 28,1%

Exercice 2

1. 21,3×(1 + 46

100) = 31,1 2. 125,9×148,7

100 = 187,2 3.

47,3 24,8

¹₃

−1 = 24%

4. 47,3×(1 + 24

100) = 58,7

Exercice 3 1. 975

1500 = 65%

2. 48

1500 = 3,2%

3. 156

414 = 37,7%

4. 150 + 48

525 = 37,7%

Exercice 4

1. 56628−68839

68839 =−17,8%

2. (a) a=

60196 68839

¹/17

= 0,992 (b) 0,992−1 =−0,8%

3. 56628×0,99⁴ = 54396

Exercice 5

1.

1− 40

100 ¹₅

−1 =−9,71%

2. (a)

1− 5

100 1− 2

100 1− 3 100

−1 =−10%

(b) 0,6

0,9 −1 =−33%

(c)

1− 33 100

¹₂

−1 =−18%

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