题目内容
计算(能简算的要简算)
3
÷7
÷7
; 5
÷
×1
;
÷2
×1
;
×1
÷1
×3.
3
| 2 |
| 7 |
| 2 |
| 3 |
| 3 |
| 5 |
| 1 |
| 7 |
| 3 |
| 26 |
| 3 |
| 4 |
| 4 |
| 7 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:把带分数改为假分数,除法改为乘法,直接约分计算.
解答:
解:(1)3
÷7
÷7
=
×
×
=
;
(2)5
÷
×1
=
×
×
=78;
(3)
÷2
×1
=
×
×
=
;
(4)
×1
÷1
×3
=
×
×
×3
=1.
| 2 |
| 7 |
| 2 |
| 3 |
| 3 |
| 5 |
=
| 23 |
| 7 |
| 3 |
| 23 |
| 5 |
| 38 |
=
| 15 |
| 266 |
(2)5
| 1 |
| 7 |
| 3 |
| 26 |
| 3 |
| 4 |
=
| 36 |
| 7 |
| 26 |
| 3 |
| 7 |
| 4 |
=78;
(3)
| 4 |
| 7 |
| 1 |
| 6 |
| 1 |
| 6 |
=
| 4 |
| 7 |
| 6 |
| 13 |
| 7 |
| 6 |
=
| 4 |
| 13 |
(4)
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
=
| 1 |
| 3 |
| 3 |
| 2 |
| 2 |
| 3 |
=1.
点评:分数四则混合运算的关键是抓住运算顺序,正确按运算顺序计算,适当利用运算定律简算.
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