题目内容
用你喜欢的方法计算.
40÷[(
-
)×3]
24×(
+
-
)
[1-(
+
)]÷
.
40÷[(
| 3 |
| 4 |
| 1 |
| 3 |
24×(
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 6 |
[1-(
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 3 |
分析:(1)先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法;
(2)运用乘法分配律简算;
(3)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法.
(2)运用乘法分配律简算;
(3)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法.
解答:解:(1)40÷[(
-
)×3],
=40÷[
×3],
=40÷
,
=32;
(2)24×(
+
-
),
=24×
+24×
-24×
,
=6+3-4,
=9-4,
=5;
(3)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=1.
| 3 |
| 4 |
| 1 |
| 3 |
=40÷[
| 5 |
| 12 |
=40÷
| 5 |
| 4 |
=32;
(2)24×(
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 6 |
=24×
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 6 |
=6+3-4,
=9-4,
=5;
(3)[1-(
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 3 |
=[1-
| 2 |
| 3 |
| 1 |
| 3 |
=
| 1 |
| 3 |
| 1 |
| 3 |
=1.
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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