Раскройте скобки и найдите значения выражения: 4 2/5+(-2/5-3/7) (8 3/4-7 2/9)+(2.25-2 7/9) 3.15+(2/3-2.15) 5/12-(1/12-2/3)

1) 7 * (4 * 5 + 2)/35 - 7 * 2/35 - 5 * 3/35 = 154/35 - 14/35 - 15/35 = 125/35 = 25/7;

2) (8 * 4 + 3)/4 - (7 * 9 + 2)/9 + 225/100 - (2 * 9 + 7)/9 = 35/4 - 65/9 + 9/4 - 25/9 = 44/4 - 90/9 = 11 - 10 = 1;

3) 315/100 + 2/3 - 215/100 = (315 - 215)/100 + 2/3 = 100/100 + 2/3 = 3/3 + 2/3 = 5/3;

4) 5/12 - 1/12 + 2/3 = 4/12 + 2/3 = 1/3 + 2/3 = 3/3 = 1;

5) (4 * 8 + 5)/8 - (2 * 8 + 3)/8 - (1 * 4 + 1)/4 = 37/8 - 19/8 - 10/8 = (37 - 19 - 10)/8 = 8/8 = 1;

6) -(8 * 15 + 14)/15 - 1/3 + 4/15 = -134/15 - 5/15 + 4/15 = (-134 - 5 + 4)/15 = -135/15 = -9;

7) (7 * 13 + 11)/13 - 32/10 - (2 * 18 + 5)/18 - 18/10 = 102/13 - 50/10 - 41/18 = 1836/234 - 1170/234 - 533/234 = (1836 - 1170 - 533)/234 = 133/234.