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1.5.3
problem 53
(a)
6
2
8
−
3
6
8
(b)
6
2
8
−
3
6
8
−
3
6
8
+
1
0
8
(c)
6
2
8
−
3
6
8
−
3
6
8
−
1
0
8
+
2
(
6
2
8
−
3
6
8
−
5
2
8
+
2
6
8
)
+
6
2
8
−
3
6
8
−
3
6
8
+
1
0
8
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