问题
解答题
(
|
答案
(
+1 2
+1 3
)÷1 5
+(1 30
+1 3
+1 5
)÷1 7
+(1 105
+1 5
+1 7
)÷1 9 1 315
=(
+1 2
+1 3
)×30+(1 5
+1 3
+1 5
)×105+(1 7
+1 5
+1 7
)×3151 9
=15+10+6+35+21+15+63+45+35
=(15+35+15+45+35)+(10+6+21+63)
=145+100
=245
故答案为:245.