题目内容
计算下列各题,写出必要的计算过程.
×
×
×5
(
+
)×
×
×
.
| 2 |
| 3 |
| 1 |
| 5 |
| 5 |
| 8 |
(
| 1 |
| 2 |
| 4 |
| 5 |
| 11 |
| 18 |
| 9 |
| 10 |
| 1 |
| 6 |
| 1 |
| 12 |
考点:分数的简便计算,分数的四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:(1)运用乘法结合律简算;
(2)先算括号内的,再算括号外的;
(3)从左往右依次计算.
(2)先算括号内的,再算括号外的;
(3)从左往右依次计算.
解答:
解:(1)
×
×
×5
=
×(
×
)×5
=
×
×5
=
×5
=
(2)(
+
)×
=
×
=
(3)
×
×
=
×
=
| 2 |
| 3 |
| 1 |
| 5 |
| 5 |
| 8 |
=
| 2 |
| 3 |
| 1 |
| 5 |
| 5 |
| 8 |
=
| 2 |
| 3 |
| 1 |
| 8 |
=
| 1 |
| 12 |
=
| 5 |
| 12 |
(2)(
| 1 |
| 2 |
| 4 |
| 5 |
| 11 |
| 18 |
=
| 13 |
| 10 |
| 11 |
| 18 |
=
| 143 |
| 180 |
(3)
| 9 |
| 10 |
| 1 |
| 6 |
| 1 |
| 12 |
=
| 3 |
| 20 |
| 1 |
| 12 |
=
| 1 |
| 80 |
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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