题目内容
简便运算.
6×
+6.4÷
-
[
-(
-
)]×
.
6×
| 5 |
| 8 |
| 8 |
| 5 |
| 5 |
| 8 |
[
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 2 |
| 9 |
| 8 |
分析:(1)把除法改为乘法,运用乘法分配律简算;
(2)先算小括号内的,再算中括号内的,最后算括号外的.
(2)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)6×
+6.4÷
-
=6×
+6.4×
-
=(6+6.4-1)×
=11.4×
=
×
=7
(2)[
-(
-
)]×
=[
-
]×
=
×
=
| 5 |
| 8 |
| 8 |
| 5 |
| 5 |
| 8 |
=6×
| 5 |
| 8 |
| 5 |
| 8 |
| 5 |
| 8 |
=(6+6.4-1)×
| 5 |
| 8 |
=11.4×
| 5 |
| 8 |
=
| 57 |
| 5 |
| 5 |
| 8 |
=7
| 1 |
| 8 |
(2)[
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 2 |
| 9 |
| 8 |
=[
| 5 |
| 6 |
| 1 |
| 4 |
| 9 |
| 8 |
=
| 7 |
| 12 |
| 9 |
| 8 |
=
| 21 |
| 32 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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