题目内容
| 计算(能简算的要简算). (1)(
|
(2)
|
(3)
| ||||||||||||||||
(4)
|
(5)[1-(
|
(6)(
|
分析:(1)运用乘法分配律简算;
(2)先把除法变成乘法,再运用乘法交换律简算;
(3)先算小括号里面的加法,再算括号外的除法;
(4)按照从左到右的顺序计算;
(5)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;
(6)先算小括号里面的加法,再算括号外的除法.
(2)先把除法变成乘法,再运用乘法交换律简算;
(3)先算小括号里面的加法,再算括号外的除法;
(4)按照从左到右的顺序计算;
(5)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;
(6)先算小括号里面的加法,再算括号外的除法.
解答:解:(1)(
+
)×
,
=
×
+
×
,
=
+
,
=
;
(2)
×8÷
,
=
×8×
,
=
×
×8,
=
×8,
=2;
(3)
÷(
+
),
=
÷
,
=
;
(4)
÷0.6×
,
=
×
,
=
;
(5)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=
;
(6)(
+
)÷
,
=
÷
,
=
.
| 5 |
| 8 |
| 5 |
| 6 |
| 4 |
| 25 |
=
| 5 |
| 8 |
| 4 |
| 25 |
| 5 |
| 6 |
| 4 |
| 25 |
=
| 1 |
| 10 |
| 4 |
| 30 |
=
| 7 |
| 30 |
(2)
| 1 |
| 5 |
| 4 |
| 5 |
=
| 1 |
| 5 |
| 5 |
| 4 |
=
| 1 |
| 5 |
| 5 |
| 4 |
=
| 1 |
| 4 |
=2;
(3)
| 35 |
| 64 |
| 1 |
| 8 |
| 3 |
| 4 |
=
| 35 |
| 64 |
| 7 |
| 8 |
=
| 5 |
| 8 |
(4)
| 18 |
| 25 |
| 2 |
| 3 |
=
| 6 |
| 5 |
| 2 |
| 3 |
=
| 4 |
| 5 |
(5)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 2 |
(6)(
| 2 |
| 6 |
| 1 |
| 2 |
| 7 |
| 6 |
=
| 5 |
| 6 |
| 7 |
| 6 |
=
| 5 |
| 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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