4.131 Вычислите.

a) 4 * 16 = 64; 64 + 11 = 75; 75 / 15 = 5; 5 * 2 = 10; 10 / 2 = 5.
б) 19 * 3 = 57; 57 - 9 = 48; 48 / 12 = 4; 4 * 25 = 100; 100 / 50 = 2.
в) 32 * 3 = 96; 96 - 48 = 48; 48 / 15 = 3.2; 3.2 * 45 = 144; 144 / 45 = 3.2.
г) 4 * 14 = 56; 56 + 40 = 96; 96 / 48 = 2; 2 * 35 = 70; 70 / 5 = 14.
д) 2 * 26 = 52; 52 - 7 = 45; 45 / 3 = 15; 15 * 6 = 90; 90 / 5 = 18.