题目内容
(2012?河池模拟)计算下面各题,怎样简便就怎样计算.
35×(1-
)÷
(156×
-26)×
×
+
÷13.
35×(1-
3 |
7 |
5 |
12 |
(156×
4 |
13 |
8 |
11 |
7 |
8 |
12 |
13 |
7 |
8 |
分析:(1)先算小括号里面的减法,再算乘法,再算除法;
(2)先算小括号里面的乘法,再算小括号里面的简算,最后算括号外的乘法;
(3)先把除法变成乘法,再运用乘法分配律简算.
(2)先算小括号里面的乘法,再算小括号里面的简算,最后算括号外的乘法;
(3)先把除法变成乘法,再运用乘法分配律简算.
解答:解:(1)35×(1-
)÷
,
=35×
÷
,
=20×
,
=48;
(2)(156×
-26)×
,
=(48-26)×
,
=22×
,
=16;
(3)
×
+
÷13,
=
×
+
×
,
=
×(
+
),
=
×1,
=
.
3 |
7 |
5 |
12 |
=35×
4 |
7 |
5 |
12 |
=20×
12 |
5 |
=48;
(2)(156×
4 |
13 |
8 |
11 |
=(48-26)×
8 |
11 |
=22×
8 |
11 |
=16;
(3)
7 |
8 |
12 |
13 |
7 |
8 |
=
7 |
8 |
12 |
13 |
7 |
8 |
1 |
13 |
=
7 |
8 |
12 |
13 |
1 |
13 |
=
7 |
8 |
=
7 |
8 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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