bonjour
A = 11/7 - 2/5 x 24/7
= 11/7 - 48/ 35
= 55 /35 - 48/35
= 7/35 = 1/5
B = ( 3/5 - 5/2) : 19/7
= ( 6/10 - 25/10) : 19/7
= - 19/10 x 7/19
= - 7/10
C = 3 x 10 ⁵ x 6 x 10 ³
= 18 x 10 ⁸ = 1 800 000 000 = 1.8 x 10 ⁹
D = 2 x 10 ¹² x 4.5 x 10 ²
= 9 x 10 ¹⁴
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