题目内容
脱式计算:
|
|
(
|
分析:(1)按照从左向右的顺序进行计算;
(2)根据除法的性质进行简算;
(3)先算乘法,再算减法,最后算除法.
(2)根据除法的性质进行简算;
(3)先算乘法,再算减法,最后算除法.
解答:解:
(1)
×3÷
,
=
÷
,
=12;
(2)
÷
÷
,
=
÷(
×
),
=
÷1,
=
;
(3)(
-
×
)÷
,
=(
-
)÷
,
=
÷
,
=
.
(1)
| 16 |
| 5 |
| 4 |
| 5 |
=
| 48 |
| 5 |
| 4 |
| 5 |
=12;
(2)
| 25 |
| 9 |
| 5 |
| 4 |
| 4 |
| 5 |
=
| 25 |
| 9 |
| 5 |
| 4 |
| 4 |
| 5 |
=
| 25 |
| 9 |
=
| 25 |
| 9 |
(3)(
| 5 |
| 9 |
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
=(
| 5 |
| 9 |
| 1 |
| 6 |
| 5 |
| 6 |
=
| 7 |
| 10 |
| 5 |
| 6 |
=
| 21 |
| 25 |
点评:考查了运算定律与简便运算,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律简便计算.
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