(9 3/4 : 5 1/5 + 3 2/5 · 2 7/34) : 1 9/16 = 6
1) 9 3/4 : 5 1/5 = 39/4 : 26/5 = 39/4 · 5/26 = (3·5)/(4·2) = 15/8 = 1 7/8
2) 3 2/5 · 2 7/34 = 17/5 · 75/34 = (1·15)/(1·2) = 15/2 = 7 1/2
3) 1 7/8 + 7 1/2 = 1 7/8 + 7 4/8 = 8 11/8 = 9 3/8
4) 9 3/8 : 1 9/16 = 75/8 : 25/16 = 75/8 · 16/25 = (3·2)/(1·1) = 6
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Пропорция: число 6 - 2,5%
число х - 100%
х = 6 · 100 : 2,5 = 240
Вiдповiдь: число 240.
(9 3/4 : 5 1/5 + 3 2/5 · 2 7/34) : 1 9/16 = 6
1) 9 3/4 : 5 1/5 = 39/4 : 26/5 = 39/4 · 5/26 = (3·5)/(4·2) = 15/8 = 1 7/8
2) 3 2/5 · 2 7/34 = 17/5 · 75/34 = (1·15)/(1·2) = 15/2 = 7 1/2
3) 1 7/8 + 7 1/2 = 1 7/8 + 7 4/8 = 8 11/8 = 9 3/8
4) 9 3/8 : 1 9/16 = 75/8 : 25/16 = 75/8 · 16/25 = (3·2)/(1·1) = 6
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Пропорция: число 6 - 2,5%
число х - 100%
х = 6 · 100 : 2,5 = 240
Вiдповiдь: число 240.