Sagot :
Réponse :
bonsoir
a. 3 x 10° + 4 x 10-1+ 7 x 10-2 = 3 + 0.4 + 0.07 = 3 .47
b. 6 x 101 + 2 x 10° + 5 x 10-1 = 0.6 + 2 + 0.5 = 3.1
c. 1 x 104 + 2 x 103 = 10 000 + 2 000 = 12 000
d. 8 x 10-4 + 9 x 10-5 = 0.0008 + 0.00009 = 0.00089
e. 4 x 10° + 3 x 10-3 + 6 x 10-4 = 4 + 0.003 + 0.0006 = 4.0036
Explications étape par étape :
Réponse:
a) 3 x 10⁰ + 4 x 10 - 1 +7 x 10 - 2
= 3 x 1 + 4 x 10 - 1 + 7 x 10 - 2
= 3 + 40 - 1 + 70 - 2
= 3 + 40 + 70 - 1 - 2
= 113 - 3
= 110
b) 6 x 101 + 2 x 10⁰ + 5 x 10 - 1
= 606 + 2 x 1 + 50 - 1
= 606 + 2 + 50 - 1
= 658 - 1
= 657
c) 1 x 104 + 2 x 103
= 104 + 206
= 310
d) 8 x 10 - 4 + 9 x 10 - 5
= 80 - 4 + 90 - 5
= 80 + 90 - 4 - 5
= 170 - 9
= 161
e) 4 x 10⁰ + 3 x 10 - 3 + 6 x 10 - 4
= 4 x 1 + 30 - 3 + 60 - 4
= 4 + 30 - 3 + 60 ‐ 4
= 4 + 30 + 60 - 3 - 4
= 94 - 7
= 87