题目内容
计算(能简算的要简算)
|
(
|
| ||||||||||||||||||||
|
[1-(
|
|
分析:(1)先算小括号里面的加法,再把除法变成乘法,运用乘法结合律简算;
(2)运用乘法分配律简算;
(3)先算小括号里面的减法,再算括号外的乘法;
(4)先把除法变成乘法,再运用乘法交换律简算;
(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)先把除法变成乘法,再运用乘法分配律简算.
(2)运用乘法分配律简算;
(3)先算小括号里面的减法,再算括号外的乘法;
(4)先把除法变成乘法,再运用乘法交换律简算;
(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)先把除法变成乘法,再运用乘法分配律简算.
解答:解:(1)
÷(
+
)×13,
=
÷
×13,
=
×(
×13),
=
×15,
=3;
(2)(
-
)×36,
=
×36-
×36,
=9-8,
=1;
(3)
×(
-
),
=
×
,
=
;
(4)
×
÷
,
=
×
×
,
=
×
×
,
=
×
,
=
;
(5)[1-(
+
)]÷
,
=[1-
]÷
,
=
×4,
=
;
(6)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 5 |
| 13 |
| 15 |
=
| 1 |
| 5 |
| 15 |
| 13 |
=
| 1 |
| 5 |
=3;
(2)(
| 1 |
| 4 |
| 2 |
| 9 |
=
| 1 |
| 4 |
| 2 |
| 9 |
=9-8,
=1;
(3)
| 1 |
| 15 |
| 1 |
| 3 |
| 1 |
| 12 |
=
| 1 |
| 15 |
| 1 |
| 4 |
=
| 1 |
| 60 |
(4)
| 5 |
| 18 |
| 1 |
| 4 |
| 10 |
| 9 |
=
| 5 |
| 18 |
| 1 |
| 4 |
| 9 |
| 10 |
=
| 5 |
| 18 |
| 9 |
| 10 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 16 |
(5)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
=
| 3 |
| 2 |
(6)
| 7 |
| 9 |
| 11 |
| 6 |
| 2 |
| 9 |
| 6 |
| 11 |
=
| 7 |
| 9 |
| 6 |
| 11 |
| 2 |
| 9 |
| 6 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 6 |
| 11 |
=1×
| 6 |
| 11 |
=
| 6 |
| 11 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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