Выполните умножение 513*3, 12*4, 4*1 12, 5*2 17, 3*1 14
Помоги!!!

5/13 * 3 = 15/13 = 1 2/13
1/2 * 4 = 4/2 = 2
4 * 1 1/2 = 4 * 3/2 = 12/2 = 6
5 * 2 1/7 = 5 * 9/7 = 45/7 = 6 3/7
3 * 1 1/4 = 3 * 5/4 =15/4 = 3 3/4 = 3.75

5/13*3=15/13=1 2/13
1/2*4=2
4*1 1/2 = 4*3/2=6
5*2 1/7 = 5*15/7=10 5/7
3*1 1/4 = 3*5/4 = 15/4=3 3/4