Представьте обыкновенные дроби в десятичные. найдите значение выражения: 1) (4,3+3 1/2):3;

1) (4,3 + 3 1/2) : 3 = (43/10 + (3 * 2 + 1)/2) : 3 = (43/10 + 7/2) * 1/3 = (43/10 + (7 * 5)/10) * 1/3 = (43/10 + 35/10) * 1/3 = (43 + 35)/10 * 1/3 = 78/10 * 1/3 = 26/10 = 2,6.

2) (3 9/20 + 2,75) : 2 = ((3 * 20 + 9)/20 + 275/100) * 1/2 = (69/20 + 55/20) * 1/2 = (69 + 55)/20 * 1/2 = 124/20 * 1/2 = 31/10 = 3.1.

3) (33,74 - 5 1/25) : 7 = (3374/100 - (5 * 25 + 1)/25) * 1/7 = (1687/50 - 126/25) * 1/7 = (1687/50 - (126 * 2)/50) * 1/7 = (1687/50 - 252/50) * 1/7 = (1687 - 252)/50 * 1/7 = 1435/50 * 1/7 = 41/10 = 4.1.

4) (37 1/5 - 6,8) : 8 = ((37 * 5 + 1)/5 - 68/10) * 1/8 = (186/5 - 34/5) * 1/8 = (186 - 34)/5 * 1/8 = 152/5 * 1/8 = 19/5 = 3.8.

5) (14,7 + 23 4/5) : 11 = (147/10 + (23 * 5 + 4)/5) * 1/11 = (147/10 + 119/5) * 1/11 = (147/10 + 238/10) * 1/11 = (147 + 238)/10 * 1/11 = 385/10 * 1/11 = 35/10 = 3.5.

6) (61,68 - 4 2/25) : 12 = (6168/100 - (4 * 25 + 2)/25) * 1/12 = (6168/100 - 102/25) * 1/12 = (6168/100 - (102 * 4)/100) * 1/12 = (6168/100 - 408/100) * 1/12 = (6168 - 408)/100 * 1/12 = 5760/100 * 1/12 = 480/100 = 4.8.