Bonjour,
1)
a)
5
5-2 = 3
3* 5 = 15
b)
40
c)
7,5
d)
0
2)
n
n-2
5(n-2) = 5n-10
5n-10 = 5*5 -10 = 25 -10 = 15 ( voir 1.a)
5n-10 = 5*10 -10 = 50-10 =40 ( voir 1.b)
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Bonjour,
1)
a)
5
5-2 = 3
3* 5 = 15
b)
40
c)
7,5
d)
0
2)
a)
n
n-2
5(n-2) = 5n-10
b)
5n-10 = 5*5 -10 = 25 -10 = 15 ( voir 1.a)
5n-10 = 5*10 -10 = 50-10 =40 ( voir 1.b)