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Sagot :

Bonjour,

1)

3*10 => 30 cm

2)

MB = 35 -10 = 25

25*4 => 100cm

3)

3x

4)

35 -x

5)

4(35-x) = 140 -4x

6)

3x = 140 -4x

x= 20

3*20 = 140 - 4*20

60 = 140 - 80

60 = 60

donc vrai

x= 25

3*25 = 140 - 4*25

75 = 140 -100

75≠ 40

donc , faux

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