Решите дам 30 балов с проверкой.

Question

Решите дам 30 балов с проверкой.

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Answer 1

1) a) (109/15 - 54/15) + 19/15 = 55/15 - 19/15 = 36/15 = 2 6/15
b) (325/12 + 29/12) - 79/12 = 354/12 - 79/12= 275/12= 22 11/12
2) 1.05 + 4.2x = 1.47
4.2x = 0.42
x = 0.1
3) 1 ар = 100 кв.м a = 25
S = ab
b = S/a = 800 / 25 = 32м