题目内容
(2012?中山模拟)4.25×5.24+1.52×2.51
9
÷[(10
-0.3)×
+10×
].
| 3 | ||||
3+
|
9
| 17 |
| 45 |
| 4 |
| 5 |
| 2 |
| 35 |
| 5 |
| 18 |
分析:(1)先算乘法,再算加法;
(2)对于这种阶梯式的繁分式化简,应从下往上逐步进行;
(3)先算10
-0.3和10×
,再算中括号内的乘法,然后算中括号内的加法,最后算括号外的除法.
(2)对于这种阶梯式的繁分式化简,应从下往上逐步进行;
(3)先算10
| 4 |
| 5 |
| 5 |
| 18 |
解答:解:(1)4.25×5.24+1.52×2.51,
=22.27+3.8152,,
=26.0852;
(2)
,
=
,
=
,
=
,
=3×
,
=
;
(3)9
÷[(10
-0.3)×
+10×
],
=9
÷[(10.8-0.3)×
+
],
=9
÷[10.5×
+
],
=9
÷[
+
],
=9
÷
,
=
×
,
=
.
=22.27+3.8152,,
=26.0852;
(2)
| 3 | ||||
3+
|
=
| 3 | ||||
3+
|
=
| 3 | ||
3+
|
=
| 3 | ||
|
=3×
| 8 |
| 33 |
=
| 8 |
| 11 |
(3)9
| 17 |
| 45 |
| 4 |
| 5 |
| 2 |
| 35 |
| 5 |
| 18 |
=9
| 17 |
| 45 |
| 2 |
| 35 |
| 25 |
| 9 |
=9
| 17 |
| 45 |
| 2 |
| 35 |
| 25 |
| 9 |
=9
| 17 |
| 45 |
| 3 |
| 5 |
| 25 |
| 9 |
=9
| 17 |
| 45 |
| 152 |
| 45 |
=
| 422 |
| 45 |
| 45 |
| 152 |
=
| 211 |
| 76 |
点评:此题考查了小数、分数的四则混合运算,掌握运算顺序,灵活处理数据是解答此类问题的关键.对于阶梯式的繁分式化简,应从下而上逐步进行.
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