Question

[4 56-2,5]*12-27*5/9

Answer 1

(4 5/6 - 2,5) * 12 - 27 * 5/9 = 13,

1) 4 5/6 - 2,5 = 29/6 - 25/10 = 145/30 - 75/30 = 70/30 = 7/3 = 2 1/3,
2) 2 1/3 * 12 = 7/3 * 12 = 7 * 4 = 28,
3) 27 * 5/9 = 3 * 5 = 15,
4) 28 - 15 = 13

Answer 2

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