题目内容
(
+
+
)÷
×
=
| 191919 |
| 989898 |
| 190190 |
| 980980 |
| 19001900 |
| 98009800 |
| 19 |
| 98 |
| 9898 |
| 1919 |
15
| 9 |
| 19 |
15
.| 9 |
| 19 |
分析:括号外的分数的分子和分母中包含着98,19这样的数字,就把括号内的数字化为分子或分母中含有这两个数的分数.
解答:解:(
+
+
)÷
×
,
=(
+
+
)÷
×
,
=(
+
+
)×
×
,
=3×
×
×
,
=
,
=15
;
故答案为:15
.
| 191919 |
| 989898 |
| 190190 |
| 980980 |
| 19001900 |
| 98009800 |
| 19 |
| 98 |
| 9898 |
| 1919 |
=(
| 19×10101 |
| 98×10101 |
| 190×1001 |
| 980×1001 |
| 1900×10001 |
| 9800×10001 |
| 19 |
| 98 |
| 98×101 |
| 19×101 |
=(
| 19 |
| 98 |
| 19 |
| 98 |
| 19 |
| 98 |
| 98 |
| 19 |
| 98 |
| 19 |
=3×
| 19 |
| 98 |
| 98 |
| 19 |
| 98 |
| 19 |
=
| 294 |
| 19 |
=15
| 9 |
| 19 |
故答案为:15
| 9 |
| 19 |
点评:根据题目给出的数值,找到规律,进行化简,进而求值.
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