3/8×2/5:7/20 решить очень срочно
3/8 * 2/5 : 7/20 = 6/40 : 7/20 = 6/40 * 20/7 = 6/2 * 1/7 = 6/14 = 3/7
3/8*2/5=6/40 (6/40)*(20/7)=3/7