题目内容
(2004?桐庐县)计算题:
4050-6300÷42
5.04×6.5-2.76
175×
+
×175
[
+
×(
-0.375)]÷
.
4050-6300÷42
5.04×6.5-2.76
175×
| 3 |
| 10 |
| 7 |
| 10 |
[
| 1 |
| 3 |
| 8 |
| 33 |
| 5 |
| 6 |
| 2 |
| 3 |
分析:(3)可据乘法分配律进行简便计算;
(1)、(2)、(4)根据四则混合运算的运算顺序计算即可.
(1)、(2)、(4)根据四则混合运算的运算顺序计算即可.
解答:解:(1)4050-6300÷42,
=4050-150,
=3900;
(2)5.04×6.5-2.76
=32.76-2.76,
=30;
(3)175×
+
×175,
=(
+
)×175,
=1×175,
=175;
(4)[
+
×(
-0.375)]÷
=[
+
×(
-
)]÷
,
=[
+
×
]×
,
=[
+
]×
,
=
×
,
=
.
=4050-150,
=3900;
(2)5.04×6.5-2.76
=32.76-2.76,
=30;
(3)175×
| 3 |
| 10 |
| 7 |
| 10 |
=(
| 3 |
| 10 |
| 7 |
| 10 |
=1×175,
=175;
(4)[
| 1 |
| 3 |
| 8 |
| 33 |
| 5 |
| 6 |
| 2 |
| 3 |
=[
| 1 |
| 3 |
| 8 |
| 33 |
| 5 |
| 6 |
| 3 |
| 8 |
| 2 |
| 3 |
=[
| 1 |
| 3 |
| 8 |
| 33 |
| 11 |
| 24 |
| 3 |
| 2 |
=[
| 1 |
| 3 |
| 1 |
| 9 |
| 3 |
| 2 |
=
| 4 |
| 9 |
| 3 |
| 2 |
=
| 2 |
| 3 |
点评:当算式中同时含有分数与小数时,要根据式中数据的特点将式中的小数化为分数或将分数化为小数后再进行计算.
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