5/7 *14=10
2/7*15=4,2
0,4 *21 1/4=0,4*85/4=8,5
0,6*17 1/2=0,6*35/2=10,5
75%=3/4
3/4*10 2/3=3/4*32/3=8
25%=1/4
1/4*48 2/3=1/4*146/3=1,2
1) 5/7 * 14 = (5*14)/7 = 5*2 = 10
2) 2/7 * 15 = (2*15)/7 = 30/7 = 4 2/7
3) 0,4 * 21 1/4 = 4/10 * 85/4 = 8,5
4) 0,6 * 17 1/2 = 6/10 * 35/2 = (3*7)/2 = 21/2 = 10,5
5) 0,75 * 10 2/3 = 3/4 * 32/3 = (3*8)/3 = 8
6) 0,25 * 48 2/3 = 25/100 * 146/3 = 1/4 * 146/3 = 73/6 = 12 1/6
Пошаговое объяснение:
