题目内容
计算下面各题,能简算的必须简算.
|
24×(
| ||||||||||||||
(15-14×
|
|
分析:(1)先算加法,再算乘法,最后算除法;
(2)根据乘法分配律进行简算;
(3)先算小括号里面的乘法,再算减法,最后算括号外面的乘法;
(4)根据乘法分配律进行简算;
(5)按照从左向右的顺序进行计算.
(2)根据乘法分配律进行简算;
(3)先算小括号里面的乘法,再算减法,最后算括号外面的乘法;
(4)根据乘法分配律进行简算;
(5)按照从左向右的顺序进行计算.
解答:解:(1)
÷[(
+
)×
]
=
÷[
×
]
=
÷
=3;
(2)24×(
+
+
)
=24×
+24×
+24×
=9+4+10
=13+10
=23;
(3)(15-14×
)×
=(15-8)×
=7×
=
;
(4)
÷5+
×
=
×
+
×
=(
+
)×
=
;
(5)
×0.375÷
=
÷
=
.
| 4 |
| 5 |
| 1 |
| 3 |
| 2 |
| 5 |
| 4 |
| 11 |
=
| 4 |
| 5 |
| 11 |
| 15 |
| 4 |
| 11 |
=
| 4 |
| 5 |
| 4 |
| 15 |
=3;
(2)24×(
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=24×
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=9+4+10
=13+10
=23;
(3)(15-14×
| 4 |
| 7 |
| 8 |
| 21 |
=(15-8)×
| 8 |
| 21 |
=7×
| 8 |
| 21 |
=
| 8 |
| 3 |
(4)
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=(
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 5 |
(5)
| 2 |
| 9 |
| 6 |
| 7 |
=
| 1 |
| 12 |
| 6 |
| 7 |
=
| 7 |
| 72 |
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定律简便计算.
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