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a. 3/15 - 10/15 = -7/15
b. 45/72 + 16/72 = 61/72
c. penyebutnya 105. 126/105 - 245/105 + 30/105 = -89/105
d. 1/2 (28/12 + 3/12) = 1/2 * 31/12 = 31/24
3 - 10 -7
------------ = -----
15 15
b.
45 + 16 61
----------- = -------
72 72
c.
126 - 245 + 30 - 89
------------------- = ----------
105 105
d.
1 (28 + 3 ) 1 31 31
---- x ------------- = --------- x ------- = -------
2 12 2 12 24