Bonjour,
15 * x - 3 * y = 15 * 1 - 3 * 2 = 15 - 6 = 9
15 * x - 3 * y = 15 * 0,5 - 3 * 1,5 = 7,5 - 4,5 = 3
15 * x - 3 * y = 15 * 3 - 3 * 15 = 45 - 45 = 0
(x + y) : 4 = (1 + 2) : 4 = 3/4
(x + y) : 4 = (0,5 - 1,5) : 4 = - 1/4
(x + y) : 4 = (3 - 15) : 4 = - 12/4 = - 3
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Bonjour,
15 * x - 3 * y = 15 * 1 - 3 * 2 = 15 - 6 = 9
15 * x - 3 * y = 15 * 0,5 - 3 * 1,5 = 7,5 - 4,5 = 3
15 * x - 3 * y = 15 * 3 - 3 * 15 = 45 - 45 = 0
(x + y) : 4 = (1 + 2) : 4 = 3/4
(x + y) : 4 = (0,5 - 1,5) : 4 = - 1/4
(x + y) : 4 = (3 - 15) : 4 = - 12/4 = - 3