1) 1 + 2\7 + X = 2
X = 2 - 1 - 2\7 = 1 - 2\7 = 5\7
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2) Y + 3 + 2\5 = 6 + 3\5
Y = 6 + 3\5 - 3 - 2\5 = 3 + 1\5 = 3.2
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3) 3 + 3\10 - X = 2 + 7\10
X = 3 + 3\10 - 2 - 7\10 = 1 + 0.3 - 0.7 = 1 - 0.4 = 0.6
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4) Y - 7 + 2\10 = 1 + 7\10
Y = 1 + 7\10 + 7 - 2\10 = 8 + 0.7 - 0.2 = 8 + 0.5 = 8.5
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Ответ:
90кг, 24л
Пояснение: 67,5/0.75 = 90
18/0.75 = 24
7/2=3 1/2
21/8=2 5/8
83/13=6 5/13
97/15=6 7/15
67/9=7 4/9