题目内容
用递等式计算.(能简算的要用简便方法计算)
|
2835÷27+741 | 64
| ||||||||||||||||
3
|
18÷1.5-5×0.3 | (
|
分析:(1)先算小括号里面的加法,再算括号外的乘法,最后算括号外的减法;
(2)先算除法,再算加法;
(3)运用乘法分配律简算;
(4)运用加法结合律和加法交换律简算;
(5)先同时运算除法和乘法,再算减法;
(6)先同时运算两个小括号里面的减法和加法,再算括号外的乘法.
(2)先算除法,再算加法;
(3)运用乘法分配律简算;
(4)运用加法结合律和加法交换律简算;
(5)先同时运算除法和乘法,再算减法;
(6)先同时运算两个小括号里面的减法和加法,再算括号外的乘法.
解答:解:(1)
-
×(
+
),
=
-
×
,
=
-
,
=
;
(2)2835÷27+741,
=105+741,
=846;
(3)64
×
+
×34
,
=(64
+34
)×
,
=99×
,
=9;
(4)3
+3.52+7
+5.48,
=(3
+7
)+(3.52+5.48),
=11+9,
=20;
(5)18÷1.5-5×0.3,
=12-1.5,
=10.5;
(6)(
-
)×(
+
),
=
×
,
=
.
6 |
7 |
6 |
7 |
2 |
3 |
1 |
9 |
=
6 |
7 |
6 |
7 |
7 |
9 |
=
6 |
7 |
2 |
3 |
=
4 |
21 |
(2)2835÷27+741,
=105+741,
=846;
(3)64
3 |
4 |
1 |
11 |
1 |
11 |
1 |
4 |
=(64
3 |
4 |
1 |
4 |
1 |
11 |
=99×
1 |
11 |
=9;
(4)3
1 |
6 |
5 |
6 |
=(3
1 |
6 |
5 |
6 |
=11+9,
=20;
(5)18÷1.5-5×0.3,
=12-1.5,
=10.5;
(6)(
7 |
8 |
5 |
16 |
5 |
9 |
2 |
3 |
=
9 |
16 |
11 |
9 |
=
11 |
16 |
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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