题目内容
计算2.25÷[
-(
+0.45)÷1
]=
| 5 |
| 6 |
| 3 |
| 8 |
| 4 |
| 5 |
6
6
.分析:此题按运算顺序进行计算,先算小括号内的加法,把0.45化成分数再计算;然后算小括号外的除法,把除法改为乘法;再算中括号内的减法,最后算括号外的除法.
解答:解:2.25÷[
-(
+0.45)÷1
],
=2.25÷[
-(
+
)÷1
],
=2.25÷[
-(
+
)÷1
],
=2.25÷[
-
÷1
],
=2.25÷[
-
×
],
=2.25÷[
-
],
=2.25÷
,
=2.25×
,
=6.
| 5 |
| 6 |
| 3 |
| 8 |
| 4 |
| 5 |
=2.25÷[
| 5 |
| 6 |
| 3 |
| 8 |
| 9 |
| 20 |
| 4 |
| 5 |
=2.25÷[
| 5 |
| 6 |
| 15 |
| 40 |
| 18 |
| 40 |
| 4 |
| 5 |
=2.25÷[
| 5 |
| 6 |
| 33 |
| 40 |
| 4 |
| 5 |
=2.25÷[
| 5 |
| 6 |
| 33 |
| 40 |
| 5 |
| 9 |
=2.25÷[
| 5 |
| 6 |
| 11 |
| 24 |
=2.25÷
| 9 |
| 24 |
=2.25×
| 24 |
| 9 |
=6.
点评:此题考查了学生对四则混合运算顺序的掌握,以及综合计算能力.
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