384.
(1/7)²=1/49
(3/5)²=9/25
(1/10)³=1/1000
(2/5)³=8/125
(1 1/3)²=(4/3)²=16/9=1 7/9
(1 1/2)³=(3/2)³=27/8=3 3/8
387.
3 1/5 *3=3*3+1/5*3=9+3/5=9 3/5 (..16/5*3=48/5=9 3/5)
5 *2 1/7=5*2+5*1/7=10+5/7=10 5/7
3 1/3 *6=3*6+1/3*6=18+6/3=18+2=20
8 *1 1/4=8*1+8*1/4=8+8/4=8+2=10
388.
1 1/2 * 2/9=3/2 * 2/9=3/9=1/3
1 1/3 * 2 1/4=4/3 * 9/4=9/3=3
7/8 * 5 1/3=7/8 * 16/3=14/3=4 2/3
2 1/2 *3/5=5/2 * 3/5=3/2=1 1/2