题目内容
怎样简便就怎样算.
43×
×19-
10÷
-
×
.
43×
| 7 |
| 44 |
| 7 |
| 18 |
| 7 |
| 18 |
10÷
| 2 |
| 5 |
| 3 |
| 4 |
| 2 |
| 9 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)把43看作44-1,运用乘法分配律简算.
(2)运用乘法分配律简算.
(3)先算除法和乘法,再算减法.
(2)运用乘法分配律简算.
(3)先算除法和乘法,再算减法.
解答:
解:(1)43×
=(44-1)×
=44×
-
=7-
=6
(2)
×19-
=
×(19-1)
=
×18
=7
(3)10÷
-
×
=10×
-
=25-
=24
| 7 |
| 44 |
=(44-1)×
| 7 |
| 44 |
=44×
| 7 |
| 44 |
| 7 |
| 44 |
=7-
| 7 |
| 44 |
=6
| 37 |
| 44 |
(2)
| 7 |
| 18 |
| 7 |
| 18 |
=
| 7 |
| 18 |
=
| 7 |
| 18 |
=7
(3)10÷
| 2 |
| 5 |
| 3 |
| 4 |
| 2 |
| 9 |
=10×
| 5 |
| 2 |
| 1 |
| 6 |
=25-
| 1 |
| 6 |
=24
| 5 |
| 6 |
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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