题目内容
计算:
(1)1
×2
÷
(2)1
÷2
÷
.
(1)1
| 4 |
| 5 |
| 5 |
| 6 |
| 5 |
| 6 |
(2)1
| 4 |
| 5 |
| 5 |
| 6 |
| 5 |
| 6 |
分析:(1)先把除法变成乘法,再运用乘法结合律简算;
(2)按照从左到右的顺序计算.
(2)按照从左到右的顺序计算.
解答:解:(1)1
×2
÷
=
×
×
=
×(
×
)
=
×
=
;
(2)1
÷2
÷
=
×
×
=
×
=
.
| 4 |
| 5 |
| 5 |
| 6 |
| 5 |
| 6 |
=
| 9 |
| 5 |
| 17 |
| 6 |
| 6 |
| 5 |
=
| 9 |
| 5 |
| 17 |
| 6 |
| 6 |
| 5 |
=
| 9 |
| 5 |
| 17 |
| 5 |
=
| 153 |
| 25 |
(2)1
| 4 |
| 5 |
| 5 |
| 6 |
| 5 |
| 6 |
=
| 9 |
| 5 |
| 6 |
| 17 |
| 6 |
| 5 |
=
| 54 |
| 85 |
| 6 |
| 5 |
=
| 324 |
| 425 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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