题目内容
|
14
|
1÷
| ||||||||||||||
1÷0.45×
|
(
|
2
|
分析:(1)(4)(6)按照从左到右的顺序计算;
(2)运用乘法结合律简算;
(3)同时运算除法,再算减法;
(5)运用乘法分配律简算.
(2)运用乘法结合律简算;
(3)同时运算除法,再算减法;
(5)运用乘法分配律简算.
解答:解:(1)
÷1
×
,
=
×
,
=
;
(2)14
×2
×4,
=
×(
×4),
=
×10,
=
;
(3)1÷
-
÷1,
=
-
,
=
;
(4)1÷0.45×
,
=
×
,
=
;
(5)(
-
+
)×36,
=
×36-
×36+
×36,
=18-6+15,
=12+15
=27;
(6)2
×0.45×3.5,
=1.125×3.5,
=3.9375.
| 2 |
| 3 |
| 1 |
| 2 |
| 7 |
| 18 |
=
| 4 |
| 9 |
| 7 |
| 18 |
=
| 14 |
| 81 |
(2)14
| 1 |
| 7 |
| 1 |
| 2 |
=
| 99 |
| 7 |
| 5 |
| 2 |
=
| 99 |
| 7 |
=
| 990 |
| 7 |
(3)1÷
| 9 |
| 11 |
| 9 |
| 11 |
=
| 11 |
| 9 |
| 9 |
| 11 |
=
| 40 |
| 99 |
(4)1÷0.45×
| 13 |
| 20 |
=
| 20 |
| 9 |
| 13 |
| 20 |
=
| 13 |
| 9 |
(5)(
| 1 |
| 2 |
| 1 |
| 6 |
| 5 |
| 12 |
=
| 1 |
| 2 |
| 1 |
| 6 |
| 5 |
| 12 |
=18-6+15,
=12+15
=27;
(6)2
| 1 |
| 2 |
=1.125×3.5,
=3.9375.
点评:此题主要考查分数、整数、小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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