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Sagot :

Bonsoir,

1)

3*49

11*7 +83

147 ≠ 160

donc non

2)

a)

3x = 2-9

3x = -7

x = -7/9

b)

6x-x = -21

5x = -21

x=  -21/5

c)

5x+4x = 13 -17

9x =-4

x = -4/9

3)

Reda: x

Lina: x+6

Nassira: x-3

x+x+6 +x-3 = 498

3x +3 = 498

3x = 498 -3

3x = 495

x = 495/3 = 165

Reda: 1,65 m

Lina: 165 + 6 =171   => 1,71m

Nasira: 165 -3 = 162 => 1,62 m

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