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Explications étape par étape

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A = 2/5 - 3/2 x 8/11

A = 2/5 - 8/2 x 3/11

A = 2/5 - 4 x 3/11

A = 2/5 - 12/11

A = (2 x 11)/(5 x 11) - (12 x 5)/(5 x 11)

A = 22/55 - 60/55

A = -38/55

B = (2 + 1/3) / (1/3 - 1)

B = (6/3 + 1/3) / (1/3 - 3/3)

B = 7/3 / (-2/3)

B = 7/3 x -3/2

B = -3/3 x 7/2

B = -7/2

C = (5 x 10^5 x (2 x 10^(-1))^3) / (24 x 10^2)

C = (5 x 2^3 / 24) x 10^(5-1*3-2)

C = (5 x 8 / 24) x 10^(3-3)

C = 5/3 x 10^0

C = 5/3