问题
解答题
(1)
(2)
(3)
(4)求+
|
答案
(1)12的因数有:1,2,3,4,6,12,
因2+3=5,所以
=5 12
+2 12
=3 12
+1 6
,1 4
因1+4=5,所以
=5 12
+1 12
=4 12
+1 12
.1 3
(2)18的因数有:1,2,3,6,9,18,
因13=1+3+9,所以
=13 18
+1 18
+3 18
=9 18
+1 18
+1 6
,1 2
(3)
+1 2
+1 6
+1 12
+1 20
+1 30
+1 42
,1 56
=
+(1 2
-1 2
)+(1 3
-1 3
)+(1 4
-1 4
)+(1 5
-1 5
)+(1 6
-1 6
)+(1 7
-1 7
),1 8
=
+1 2
-1 2
+1 3
-1 3
+1 4
-1 4
+1 5
-1 5
+1 6
-1 6
+1 7
-1 7
,1 8
=1-
,1 8
=
.7 8
(4)
×11<10 110
+10 100
+10 101
…+10 102
<10 110
×11.10 100
1<
+10 100
+10 101
…+10 102
<1.1.10 110
所以它的整数部分是1.
故答案为:6(或12),4(或3),18,6,2,
,1.7 8