1.

丁一11-412-13+ 43 2323-3

Answer»

a) 2/3 - 1/3 = 1/3

4/3 - 2/3 = 2/3

2/3 + 4/3 = 6/3 = 2

1/3 + 2/3 = 3/3 = 1

2-1 = 1

thanks



Discussion

No Comment Found