题目内容
(2013?龙海市模拟)能用简便方法算的要用简便方法算
| 750+1410÷47×35 |
|
[1-(
|
|
分析:(1)先算除法,再算乘法,最后算加法,
(2)运用乘法的分配律进行简算,
(3)先算小括号里的加法,再算中括号里的减法,最后算括号外的除法,
(4)先算乘法,再运用加法的结合律进行简算.
(2)运用乘法的分配律进行简算,
(3)先算小括号里的加法,再算中括号里的减法,最后算括号外的除法,
(4)先算乘法,再运用加法的结合律进行简算.
解答:解:(1)750+1410÷47×35,
=750+30×35,
=750+1050,
=1800;
(2)
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=
;
(4)
+
×
+
,
=
+
+
,
=
+(
+
),
=
+1,
=1
.
=750+30×35,
=750+1050,
=1800;
(2)
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=(
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
(3)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 9 |
| 4 |
=[1-
| 5 |
| 8 |
| 9 |
| 4 |
=
| 3 |
| 8 |
| 9 |
| 4 |
=
| 1 |
| 6 |
(4)
| 6 |
| 7 |
| 5 |
| 9 |
| 3 |
| 2 |
| 1 |
| 6 |
=
| 6 |
| 7 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 6 |
| 7 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 6 |
| 7 |
=1
| 6 |
| 7 |
点评:考查了整数、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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