题目内容
计算下面各题.
|
(
|
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(
|
|
6÷
|
分析:(1)先算小括号里面的加法,再算中括号里面的乘法,最后算括号外的除法;
(2)先运用乘法分配律简算,再算最后的加法;
(3)先算除法,再算减法,最后算加法;
(4)先算小括号里面的加法,再算小括号里面的减法,最后算括号外的除法;
(5)先把除法变成乘法,再运用乘法分配律简算;
(6)同时运算除法,再算减法.
(2)先运用乘法分配律简算,再算最后的加法;
(3)先算除法,再算减法,最后算加法;
(4)先算小括号里面的加法,再算小括号里面的减法,最后算括号外的除法;
(5)先把除法变成乘法,再运用乘法分配律简算;
(6)同时运算除法,再算减法.
解答:解:(1)
÷[(
+
)×
]
=
÷[
×
],
=
÷
,
=
;
(2)(
-
)×24+
,
=24×
-
×24+
,
=20-14+
,
=6+
,
=6
;
(3)
÷
-
+
,
=
-
+
,
=
+
-
,
=1-
,
=
;
(4)(
+
-
)÷7,
=(
-
)÷7,
=0÷7,
=0;
(5)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(6)6÷
-
÷6,
=7-
,
=6
.
| 4 |
| 5 |
| 1 |
| 2 |
| 2 |
| 3 |
| 4 |
| 7 |
=
| 4 |
| 5 |
| 7 |
| 6 |
| 4 |
| 7 |
=
| 4 |
| 5 |
| 4 |
| 6 |
=
| 6 |
| 5 |
(2)(
| 5 |
| 6 |
| 7 |
| 12 |
| 1 |
| 3 |
=24×
| 5 |
| 6 |
| 7 |
| 12 |
| 1 |
| 3 |
=20-14+
| 1 |
| 3 |
=6+
| 1 |
| 3 |
=6
| 1 |
| 3 |
(3)
| 1 |
| 2 |
| 2 |
| 3 |
| 2 |
| 5 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 5 |
=1-
| 2 |
| 5 |
=
| 3 |
| 5 |
(4)(
| 1 |
| 2 |
| 1 |
| 12 |
| 7 |
| 12 |
=(
| 7 |
| 12 |
| 7 |
| 12 |
=0÷7,
=0;
(5)
| 5 |
| 7 |
| 2 |
| 3 |
| 2 |
| 7 |
| 3 |
| 2 |
=
| 5 |
| 7 |
| 2 |
| 3 |
| 2 |
| 7 |
| 2 |
| 3 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
| 2 |
| 3 |
=1×
| 2 |
| 3 |
=
| 2 |
| 3 |
(6)6÷
| 6 |
| 7 |
| 6 |
| 7 |
=7-
| 1 |
| 7 |
=6
| 6 |
| 7 |
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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