1) 30 + 120 = 150 (м) - длина поля
2) S = 30 × 150 = 4500 (м²)
4500 м² = 45 ара.
ответ: 45 ара.
Пошаговое объяснение:
₁ ₅ ₂ ₆ ₃ ₇ ₄ ₈
(28 : 1 3/4 + 1 1/3 : 22 + 1 2/3 * 9 3/12 + 4 : 1 1/2) * 3 1/7 = 107 13/42,
1) 28 : 1 3/4 = 28 : 7/4 = 28 * 4/7 = (сокращ. 28 и 7) = 4 * 4 = 16,
2) 1 1/3 : 22 = 4/3 * 1/22 = (сокращ. 4 и 22) = 2/33,
3) 1 2/3 * 9 3/12 = 5/3 * 111/12 = (сокращ. 111 и 3) = 185/12 = 15 5/12,
4) 4 : 1 1/2 = 4 : 3/2 = 4 * 2/3 = 8/3 = 2 2/3,
5) 16 + 2/33 = 16 2/33,
6) 16 2/33 + 15 5/12 = (16 + 15) + (2/33 + 5/12) = 31 + (8/132 + 55/132) =
= 31 + 63/132 = 31 + 21/44 = 31 21/44,
7) 31 21/44 + 2 2/3 = (31 + 2) + (21/44 + 2/3) = 33 + (63/132 + 88/132) =
= 33 + 151/132 = 33 + 1 19/132 = 34 19/132,
8) 34 19/132 * 3 1/7 = 4507/132 * 22/7 = 4507/42 = 107 13/42
45 Ар
a-30m
b-30+120=150
S=a*b
S=30*150=4500m
1м²=0.01 Ар
4500m = 45 Аров