Сократите: 1) 12*21 / 35*15; 3) 25*17*44 / 51*8*75; 5) 17*48 / (17*16 - 9*16); 2) 72*11 / 33*30; 4) (8*3+8*23) / 3*16;

1) 12*21 / 35*15 = 4*3 / 5*5 = 12/25; 2) 72*11 / 33*30 = 12*1 / 3*5 = 12/15; 3) 25*17*44 / 51*8*75 = 1*1*11 / 3*2*3 = 11/18; 4) (8*3+8*23) / 3*16 = 8*(3+23) / 3*16 = 1*26 / 3*2 = 13 / 3*1 = 13/3 = 4 1/3; 5) 17*48 / (17*16 - 9*16) = 17*48 / 16*(17-9) = 17*3 / 1*8 = 51/8 = 6 3/8;6) (14*5 - 14*3) / (21*9 + 21*3) = 14*(5-3) / 21*(9+3) = 14*2 / 21*12 = 2*1 / 3*6 = 1/9.