(1/4 - 2/3) * (4/5 - 2/15) * (-3/5) = 1/6
1) 1/4 - 2/3 = 3/12 - 8/12 = - 5/12
2) 4/5 - 2/15 = 12/15 - 2/15 = 10/15 = 2/3
3) - 5/12 * 2/3 = - (5*1)/(6*3) = - 5/18
4) - 5/18 * (-3/5) = 3/18 = 1/6
Вот3 ц 80 кг = 3 ц * 100 кг + 80 кг = 380 кг
907*356=322892
954*243=231822