Найти произведение: 1) 4/27*9/16 2)5 3/5*1 4/21 3)3 4/15*1 17/28*4/7 4)13/21*32

1) 4/27 * 9/16 = (4 * 9)/(27 * 16) = 36/432 = 1/12. 2) 5 3/5 * 1 4/21 = 28/5 * 25/21 = (28 * 25)/(5 * 21) = 700/105 = 140/21 = 6 14/21. 3) 3 4/15 * 1 17/28 * 4/6 = 49/15 * 45/28 * 4/7 = (49 * 45)/(15 * 28) * 4/7 = 2205/420 * 4/6 = (2205 * 4)/(420 * 6) * 4/6 = 8820/2520 * 4/6 = 820/252 * 4/6 = 410/126 * 4/6 = 205/63 * 4/6 = (205 * 4)/(63 * 6) = 820/378 = 2 64/378 = 2 32/189. 4) 13/21 * 32 = (13 * 32)/21 = 416/21= 19 17/21.