AIDE MOI VITE SI VOUS PLAIT? Calcule le plus astucieusement possible. a)6+17+4+28+13+22 b)25 x 8 x 4 x 5 c)7+75+47+23+25 d)259+38+41+71+62 e)75 x 5 x 20 x 2 f)2

 6 + 17 + 4 + 28 + 13 + 22= 90
25 X 8 X 4 X 5 = 4 000
7 +75 + 47 + 23 + 25 = 177
259 + 38 + 41 + 71 + 62 = 
259 +41 = 300 + 38 + 62 = 138            + 71 = 471
75 X 5 X 20 X 2 = 15 000
25  X 8 X 7 X 4 = 
200 X 7 = 1400 X 4 = 5 600

Calcule le plus astucieusement possible.

a)6+17+4+28+13+22
= 6 + 4 + 28 + 22 + 17 + 13
= 10 + 50 + 30
= 60 + 30
= 90

b)25 x 8 x 4 x 5
25 x 4 = 100
8 x 5 = 40
100 x 40 = 4000

c)7+75+47+23+25
= 47 + 23 + 75 + 25 + 7
= 70 + 100 + 7
= 170 + 7
= 177

d)259+38+41+71+62
= 259 + 41 + 38 + 62 + 71
= 300 + 100 + 74
= 400 + 71
= 471

e)75 x 5 x 20 x 2
75 x 2 = 150
20 x 5 = 100
150 x 100 = 15000

f)250 x 8 x 7 x 4
250 x 4 = 1000
8 x 7 = 56
1000 x 56 = 56000