题目内容
(1)
÷(
÷
+
)
(2)
×
÷
÷
.
| 15 |
| 16 |
| 5 |
| 12 |
| 5 |
| 8 |
| 3 |
| 8 |
(2)
| 1 |
| 7 |
| 9 |
| 13 |
| 5 |
| 14 |
| 3 |
| 13 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算括号内的除法,再算括号内的加法,最后算括号外的除法.
(2)把除法变为乘法,运用乘法交换律与结合律简算.
(2)把除法变为乘法,运用乘法交换律与结合律简算.
解答:
解:(1)
÷(
÷
+
)
=
÷(
×
+
)
=
÷(
+
)
=
÷
=
×
=
(2)
×
÷
÷
=
×
×
×
=(
×
)×(
×
)
=
×3
=
| 15 |
| 16 |
| 5 |
| 12 |
| 5 |
| 8 |
| 3 |
| 8 |
=
| 15 |
| 16 |
| 5 |
| 12 |
| 8 |
| 5 |
| 3 |
| 8 |
=
| 15 |
| 16 |
| 2 |
| 3 |
| 3 |
| 8 |
=
| 15 |
| 16 |
| 25 |
| 24 |
=
| 15 |
| 16 |
| 24 |
| 25 |
=
| 9 |
| 10 |
(2)
| 1 |
| 7 |
| 9 |
| 13 |
| 5 |
| 14 |
| 3 |
| 13 |
=
| 1 |
| 7 |
| 9 |
| 13 |
| 14 |
| 5 |
| 13 |
| 3 |
=(
| 1 |
| 7 |
| 14 |
| 5 |
| 9 |
| 13 |
| 13 |
| 3 |
=
| 2 |
| 5 |
=
| 6 |
| 5 |
点评:此题是考查四则混合运算,注意按顺序和运算法则,灵活运用运算定律进行简便计算.
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