题目内容
计算:
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|
12÷(
|
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|
|
|
27×(3-
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|
|
|
|
分析:(1)(4)(6)(10)可根据乘法交换律计算;
(2)(3)(5)(7)(9)(12)根据四则混合运算的运算顺序计算即可;
(8)(11)根据乘法分配律计算即可.
(2)(3)(5)(7)(9)(12)根据四则混合运算的运算顺序计算即可;
(8)(11)根据乘法分配律计算即可.
解答:解:(1)
÷
×
=
×
×10,
=
;
(2)
×
×
=
;
(3)12÷(
×
)
=12×
,
=
;
(4)
÷3×
=
×
×
,
=
;
(5)
÷(1÷
)
=
×
,
=
;
(6)
÷
×
=
×
×
,
=
;
(7)
+4×
=
+
,
=4;
(8)27×(3-
)
=27×3-27×
,
=51-12,
=39;
(9)
÷
-
=
-
,
=
;
(10)
×
×
=
×
×
,
=
×
,
=
;
(11)
×26+
×26
=(
+
)×26,
=1×26,
=26;
(12)
×
+
÷
=
+
,
=
.
| 9 |
| 16 |
| 1 |
| 10 |
| 8 |
| 25 |
=
| 9 |
| 16 |
| 8 |
| 25 |
=
| 9 |
| 5 |
(2)
| 7 |
| 9 |
| 3 |
| 35 |
| 18 |
| 4 |
| 3 |
| 10 |
(3)12÷(
| 4 |
| 7 |
| 14 |
| 5 |
=12×
| 5 |
| 8 |
=
| 15 |
| 2 |
(4)
| 7 |
| 15 |
| 5 |
| 14 |
=
| 7 |
| 15 |
| 5 |
| 14 |
| 1 |
| 3 |
=
| 1 |
| 18 |
(5)
| 3 |
| 16 |
| 8 |
| 3 |
=
| 3 |
| 16 |
| 8 |
| 3 |
=
| 1 |
| 2 |
(6)
| 7 |
| 24 |
| 3 |
| 5 |
| 6 |
| 35 |
=
| 7 |
| 24 |
| 6 |
| 35 |
| 5 |
| 3 |
=
| 1 |
| 12 |
(7)
| 1 |
| 2 |
| 7 |
| 8 |
=
| 1 |
| 2 |
| 7 |
| 2 |
=4;
(8)27×(3-
| 4 |
| 9 |
=27×3-27×
| 4 |
| 9 |
=51-12,
=39;
(9)
| 5 |
| 21 |
| 1 |
| 3 |
| 4 |
| 21 |
=
| 15 |
| 21 |
| 4 |
| 21 |
=
| 11 |
| 21 |
(10)
| 7 |
| 4 |
| 3 |
| 5 |
| 2 |
| 7 |
=
| 7 |
| 4 |
| 2 |
| 7 |
| 3 |
| 5 |
=
| 1 |
| 2 |
| 3 |
| 5 |
=
| 3 |
| 10 |
(11)
| 5 |
| 6 |
| 1 |
| 6 |
=(
| 5 |
| 6 |
| 1 |
| 6 |
=1×26,
=26;
(12)
| 2 |
| 5 |
| 1 |
| 6 |
| 3 |
| 5 |
| 3 |
| 2 |
=
| 1 |
| 15 |
| 6 |
| 15 |
=
| 7 |
| 15 |
点评:完成本细心分析式中数据,注意通分约分.
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