tolong di bantu ya kak..... 1.65 15/21 + 67 17/28= 2.325 7/10 - 172 3/10= 3.527 - 7/15=

1.
65 15/21 + 67 17/28
=65 60/84 + 67 51/84
=132 111/84
=132+1 27/84
=133 9/28

2.
325 7/10 - 172 3/10
=153 4/10
=153 2/5

3.
527 - 7/15
=7905/15 -7/15
=7898/15
=526 8/15

Semoga bisa membantu...