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Sagot :

WINNER123
Bonsoir

A = 7/15 -2/15 x 9/4
tu dois commencer par la multiplication
A = 7/15 - 18/60
A = 28/60 - 18/60 = 10/60 =  1/6

B = 25 x 3 x 10^4 sur 2 x 10²
B = 75 x 10^4 sur 2 x10²
B = 37.5 x 10^²
B = 3.75 x 10² x10² = 3.75 x 10^4

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