Выполните действия 91×2/5÷5,6+3,48÷6/25×1,8

91×2/5÷5,6+3,48÷6/25×1,8 = 21.1) 91 × 2 /5 = 91·2 /5 = 182/ 5 = 2 + 36·5/ 5 = 36 2/ 5 = 36.4.2) 36.4 : 5.6 = 6.5.3)348/ 100 ÷ 6/ 25 = 87·4 /25·4 ÷ 6/ 25 = 87/ 25 ÷ 6/ 25 = 87/ 25 × 25/ 6 = 87·25/ 25·6 = 2175/ 150 = 29·75 /2·75 = 29/ 2 = 1 + 14·2 /2 = 14 1/ 2 = 14.5.4) 6.5 + 14.5 = 21.