问题 解答题
59
1
2
×
2
3
+79
1
3⋅
×
3
4
+99
1
4
×
4
5
+119
1
5
×
5
6
答案

59

1
2
×
2
3
+79
1
3
×
3
4
+99
1
4
×
4
5
+119
1
5
×
5
6

=(60-

1
2
)×
2
3
+(80-
2
3
)×
3
4
+(100-
3
4
)×
4
5
+(120-
4
5
)×
5
6

=60×

2
3
-
1
2
×
2
3
+80×
3
4
-
2
3
×
3
4
+100×
4
5
-
3
4
×
4
5
+120×
5
6
-
4
5
×
5
6

=40-

1
3
+60-
1
2
+80-
3
5
+100-
2
3

=(40+60+80+100)-(

1
3
+
1
2
+
3
5
+
2
3
),

=280-2

1
10

=277

9
10

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