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b)
c)
d)
e)
f)
0,9 - 3/8 = 0,9 - 0,375 = 0,525
1 1/3 + 0,25 = 1 1/3 + 1/4 = 1 4/12 + 3/12 = 1 7/12
2,73 + 9 2/3 = 2 73/100 + 9 2/3 = 2 219/300 + 9 200/300 = 12 119/300
7/100 + 10,3 = 0,07 + 10,3 = 10,37
4 5/9 + 1,5 = 4 5/9 + 1 1/2 = 4 10/18 + 1 9/18 = 6 1/18