题目内容
计算下面各题
|
45×
|
27×
| ||||||||||||||||
35÷(
|
|
(
|
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)按照先算乘法,再从左到右顺序减数即可解答,
(2)(3)运用乘法分配律解答,
(4)(5)(6)按照先算括号里面的,再算括号外面的顺序减数即可解答.
(2)(3)运用乘法分配律解答,
(4)(5)(6)按照先算括号里面的,再算括号外面的顺序减数即可解答.
解答:
解:(1)
+
×
-
=
+
-
=
-
=
;
(2)45×
-
×45
=(45-45)×
=0×
=0;
(3)27×
+27÷5
=27×(
+
)
=27×1
=27;
(4)35÷(
÷
)
=35÷
=12
;
(5)
×(
-
)
=
×
=
;
(6)(
-
)×
=
×
=
.
| 1 |
| 16 |
| 1 |
| 2 |
| 5 |
| 8 |
| 1 |
| 3 |
=
| 1 |
| 16 |
| 5 |
| 16 |
| 1 |
| 3 |
=
| 3 |
| 8 |
| 1 |
| 3 |
=
| 1 |
| 24 |
(2)45×
| 4 |
| 9 |
| 4 |
| 9 |
=(45-45)×
| 4 |
| 9 |
=0×
| 4 |
| 9 |
=0;
(3)27×
| 4 |
| 5 |
=27×(
| 4 |
| 5 |
| 1 |
| 5 |
=27×1
=27;
(4)35÷(
| 6 |
| 5 |
| 3 |
| 7 |
=35÷
| 14 |
| 5 |
=12
| 1 |
| 2 |
(5)
| 3 |
| 10 |
| 5 |
| 7 |
| 10 |
| 21 |
=
| 3 |
| 10 |
| 5 |
| 21 |
=
| 1 |
| 14 |
(6)(
| 7 |
| 8 |
| 3 |
| 4 |
| 7 |
| 15 |
=
| 1 |
| 8 |
| 7 |
| 15 |
=
| 7 |
| 120 |
点评:本题主要考查学生依据四则运算计算方法,以及正确运用简便方法解决问题的能力.
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