题目内容
计算各题,能简便运算的写出主要过程.
36×(
|
| ||||||||||||
23-
|
[1-(
|
分析:(1)(2)运用乘法分配律简算;
(3)先算乘法,再算除法,最后算减法;
(4)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法.
(3)先算乘法,再算除法,最后算减法;
(4)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法.
解答:解:(1)36×(
+
+
),
=36×
+36×
+36×
,
=9+6+4,
=15+4,
=19;
(2)
×7+
×11,
=
×(7+11),
=
×18,
=10;
(3)23-
×
÷
,
=23-
÷
,
=23-18,
=5;
(4)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=
.
1 |
4 |
1 |
6 |
1 |
9 |
=36×
1 |
4 |
1 |
6 |
1 |
9 |
=9+6+4,
=15+4,
=19;
(2)
5 |
9 |
5 |
9 |
=
5 |
9 |
=
5 |
9 |
=10;
(3)23-
8 |
9 |
3 |
4 |
1 |
27 |
=23-
2 |
3 |
1 |
27 |
=23-18,
=5;
(4)[1-(
1 |
4 |
3 |
8 |
1 |
4 |
=[1-
5 |
8 |
1 |
4 |
=
3 |
8 |
1 |
4 |
=
3 |
2 |
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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