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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