bonjour
A = 28 /3 : ( 9/3 - 2 /3 )
⇔ 28/3 : 7/3
⇔ 28/3 * 3 /7
⇔ 84/21
= 4
B = 3.9 * 10 ⁻⁴ / 3 * 10 ⁻⁵
= 1.3 * 10
= 13
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bonjour
A = 28 /3 : ( 9/3 - 2 /3 )
⇔ 28/3 : 7/3
⇔ 28/3 * 3 /7
⇔ 84/21
= 4
B = 3.9 * 10 ⁻⁴ / 3 * 10 ⁻⁵
= 1.3 * 10
= 13