题目内容
计算下面各题.(能简单的要简算)
|
(
| ||||||||||||||
|
(27÷
|
分析:(1)运用乘法的分配律进行简算,
(2)运用乘法的分配律进行简算,
(3)先算小括号里的减法,再算括号外的乘法,最后算减法,
(4)先算小括号里的两个除法,再算小括号里的减法,最后算括号外的乘法.
(2)运用乘法的分配律进行简算,
(3)先算小括号里的减法,再算括号外的乘法,最后算减法,
(4)先算小括号里的两个除法,再算小括号里的减法,最后算括号外的乘法.
解答:解:(1)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)(
+
)×36,
=
×36+
×36,
=9+8,
=17;
(3)
×(
-
)-
,
=
×
-
,
=
-
,
=
;
(4)(27÷
-3÷
)×
,
=(57-42)×
,
=15×
,
=
.
| 7 |
| 9 |
| 1 |
| 6 |
| 2 |
| 9 |
| 1 |
| 6 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 1 |
| 6 |
=1×
| 1 |
| 6 |
=
| 1 |
| 6 |
(2)(
| 1 |
| 4 |
| 2 |
| 9 |
=
| 1 |
| 4 |
| 2 |
| 9 |
=9+8,
=17;
(3)
| 7 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 16 |
=
| 7 |
| 8 |
| 1 |
| 4 |
| 3 |
| 16 |
=
| 7 |
| 32 |
| 3 |
| 16 |
=
| 1 |
| 32 |
(4)(27÷
| 9 |
| 19 |
| 1 |
| 14 |
| 5 |
| 9 |
=(57-42)×
| 5 |
| 9 |
=15×
| 5 |
| 9 |
=
| 25 |
| 3 |
点评:考查了分数四则混合运算的顺序,注意灵活运用运算定律进行简算.
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