Bonjour,
1) 7 950 ÷ 2 = 3 975
3 975 ÷ 3 = 1 325
1 325 ÷ 5 = 265
265 ÷ 5 = 53
donc : 7 950 = 2 × 3 × 5² × 53
5 400 ÷ 2 = 2 700
2 700 ÷ 2 = 1 350
1 350 ÷ 2 = 675
675 ÷ 3 = 225
225 ÷ 3 = 75
75 ÷ 3 = 25
25 ÷ 5 = 5
donc : 5 400 = 2³ × 3³ × 5²
2) PGCD de 7 950 et 5 400 = 2 × 3 × 5² = 150
3) a) 150
b) masse de riz = 7 950 g ÷ 150 = 53 g
masse de rougail = 5 400 g ÷ 150 = 36 g
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Bonjour,
1) 7 950 ÷ 2 = 3 975
3 975 ÷ 3 = 1 325
1 325 ÷ 5 = 265
265 ÷ 5 = 53
donc : 7 950 = 2 × 3 × 5² × 53
5 400 ÷ 2 = 2 700
2 700 ÷ 2 = 1 350
1 350 ÷ 2 = 675
675 ÷ 3 = 225
225 ÷ 3 = 75
75 ÷ 3 = 25
25 ÷ 5 = 5
donc : 5 400 = 2³ × 3³ × 5²
2) PGCD de 7 950 et 5 400 = 2 × 3 × 5² = 150
3) a) 150
b) masse de riz = 7 950 g ÷ 150 = 53 g
masse de rougail = 5 400 g ÷ 150 = 36 g