题目内容
A=
+
×2+
×3+…+
×10,与A最接近的整数是______.
| 19 |
| 97 |
| 19 |
| 97 |
| 19 |
| 97 |
| 19 |
| 97 |
A=
+
×2+
×3+…+
×10,
=
×(1+2+3+…9+10),
=
×[(1+10)×10÷2],
=
×55,
=
,
=
,
=10
,
≈11;
所以与A最接近的整数是11.
故填:11.
| 19 |
| 97 |
| 19 |
| 97 |
| 19 |
| 97 |
| 19 |
| 97 |
=
| 19 |
| 97 |
=
| 19 |
| 97 |
=
| 19 |
| 97 |
=
| 19×55 |
| 97 |
=
| 1045 |
| 97 |
=10
| 75 |
| 97 |
≈11;
所以与A最接近的整数是11.
故填:11.
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