题目内容
(2005?铜山县)脱式计算.
25×124+3600÷240 | 5.02-1.25-2.75 | (
| ||||||||||||
1-(4.3×0.2-0.106) | [1-(
|
(
|
分析:(1)同时运算乘法和除法,再算加法;
(2)运用减法的性质简算;
(3)先算小括号里面的减法,再算括号外的除法,最后算加法;
(4)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外的减法;
(5)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;
(6)运用乘法分配律简算.
(2)运用减法的性质简算;
(3)先算小括号里面的减法,再算括号外的除法,最后算加法;
(4)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外的减法;
(5)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;
(6)运用乘法分配律简算.
解答:解:(1)25×124+3600÷240,
=3100+15,
=3115;
(2)5.02-1.25-2.75,
=5.02-(1.25+2.75),
=5.02-4,
=1.02;
(3)(
-
)÷
+
,
=
÷
+
,
=
+
,
=
;
(4)1-(4.3×0.2-0.106),
=1-(0.86-0.106),
=1-0.754,
=0.246;
(5)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=
;
(6)(
+
-
)×12,
=
×12+
×12-
×12,
=2+3-4,
=1.
=3100+15,
=3115;
(2)5.02-1.25-2.75,
=5.02-(1.25+2.75),
=5.02-4,
=1.02;
(3)(
4 |
5 |
1 |
4 |
11 |
12 |
1 |
6 |
=
11 |
20 |
11 |
12 |
1 |
6 |
=
3 |
5 |
1 |
6 |
=
23 |
30 |
(4)1-(4.3×0.2-0.106),
=1-(0.86-0.106),
=1-0.754,
=0.246;
(5)[1-(
2 |
5 |
1 |
3 |
2 |
5 |
=[1-
11 |
15 |
2 |
5 |
=
4 |
15 |
2 |
5 |
=
2 |
3 |
(6)(
1 |
6 |
1 |
4 |
1 |
3 |
=
1 |
6 |
1 |
4 |
1 |
3 |
=2+3-4,
=1.
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.
练习册系列答案
相关题目