Mathematics
Senior High
想問為何可以做紅筆底線那樣的運算呢？
（原式已用鉛筆抄上）
8.4或-2^31
解析
90 +990) x
406
49
90
1.原式=(
31-3 406-4
+
49-4
) X
90
990
90
28 402
1
=(
+
-
90
990
2
710
X
990
-2
1
355
71
990
198
Answers
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