题目内容
能简算的要简算.
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|
|
(
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[1-(
|
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分析:(1)按照从左到右的顺序计算;
(2)先算小括号里面的加法,再算括号外的除法;
(3)(4)(6)运用乘法分配律简算;
(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;
(7)先把除法变成乘法,再运用乘法分配律简算.
(2)先算小括号里面的加法,再算括号外的除法;
(3)(4)(6)运用乘法分配律简算;
(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;
(7)先把除法变成乘法,再运用乘法分配律简算.
解答:解:(1)
×
÷
,
=
×
×
,
=
×
,
=1;
(2)
÷(
+
),
=
÷
,
=
;
(3)
×7+
×11,
=
×(7+11),
=
×18,
=10;
(4)(
-
)×36,
=
×36-
×36,
=21-10,
=11;
(5)[1-(
+
)]÷
,
=(1-
)÷
,
=
×4,
=
;
(6)
×99+
,
=
×(99+1),
=
×100,
=16;
(7)
×
+
÷1
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
| 3 |
| 4 |
| 6 |
| 13 |
| 9 |
| 26 |
=
| 3 |
| 4 |
| 6 |
| 13 |
| 26 |
| 9 |
=
| 9 |
| 26 |
| 26 |
| 9 |
=1;
(2)
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 3 |
=
| 4 |
| 9 |
| 2 |
| 3 |
=
| 2 |
| 3 |
(3)
| 5 |
| 9 |
| 5 |
| 9 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
=10;
(4)(
| 7 |
| 12 |
| 5 |
| 18 |
=
| 7 |
| 12 |
| 5 |
| 18 |
=21-10,
=11;
(5)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=(1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
=
| 3 |
| 2 |
(6)
| 4 |
| 25 |
| 4 |
| 25 |
=
| 4 |
| 25 |
=
| 4 |
| 25 |
=16;
(7)
| 3 |
| 5 |
| 2 |
| 3 |
| 2 |
| 5 |
| 1 |
| 2 |
=
| 3 |
| 5 |
| 2 |
| 3 |
| 2 |
| 5 |
| 2 |
| 3 |
=(
| 3 |
| 5 |
| 2 |
| 5 |
| 2 |
| 3 |
=1×
| 2 |
| 3 |
=
| 2 |
| 3 |
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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