问题
解答题
59
|
答案
59
×1 2
+792 3
×1 3
+993 4
×1 4
+1194 5
×1 5
,5 6
=(60-
)×1 2
+(80-2 3
)×2 3
+(100-3 4
)×3 4
+(120-4 5
)×4 5
,5 6
=60×
-2 3
×1 2
+80×2 3
-3 4
×2 3
+100×3 4
-4 5
×3 4
+120×4 5
-5 6
×4 5
,5 6
=40-
+60-1 3
+80-1 2
+100-3 5
,2 3
=(40+60+80+100)-(
+1 3
+1 2
+3 5
),2 3
=280-2
,1 10
=277
.9 10