Сократите дроби : 8*5/28*16. 14*7+14*2/14*10. 15*4+15*5/18*45.

8*5 / 28*16 = 5 / 28*2 = 5/56,

14*7+14*2 / 14*10 = 14*(7+2) / 14*10 = 14*9 / 14/10 = 9/10,

15*4+15*5 / 18*45 = 15*(4+5) / 18*45 = 15*9 / 18*45 = 1 /2*3 = 1/6.