题目内容
直接写出得数.
20+30= | 12×3= | 3.5-0.2= | 33÷1.1 | 99×6= | ||||||||||||||||
0.65+2.35= | 0.1×0.03= | 651-105= | 2-
|
| ||||||||||||||||
1÷
|
|
|
|
12÷
| ||||||||||||||||
2+
|
|
|
|
(0.27+0.9)÷0.9= |
分析:(1)(2)(3)(4)(5)(6)(7)(8)依据整数和小数四则运算计算方法解答;
(9)(10)(14)(16)依据分数加、减法计算方法先通分再解答;
(11)(12)(13)(17)(19)根据分数乘、除法的计算法则,进行计算,计算过程中能约分的要先约分再计算;
(15)根据0乘以或除以非0的数都得0进行计算;
(18)根据加法交换律和结合律进行计算;
(20)根据乘法分配律进行计算.
(9)(10)(14)(16)依据分数加、减法计算方法先通分再解答;
(11)(12)(13)(17)(19)根据分数乘、除法的计算法则,进行计算,计算过程中能约分的要先约分再计算;
(15)根据0乘以或除以非0的数都得0进行计算;
(18)根据加法交换律和结合律进行计算;
(20)根据乘法分配律进行计算.
解答:解:(1)20+30=50;
(2)12×3=36;
(3)3.5-0.2=3.2;
(4)33÷1.1=30;
(5)99×6=594;
(6)0.65+2.35=3;
(7)0.1×0.03=0.003;
(8)651-105=546;
(9)2-
=1
;
(10)
+
=
;
(11)1÷
=4
;
(12)
×26=12;
(13)
÷
=2;
(14)
-
=
;
(15)12÷
×0=0;
(16)2+
=2
;
(17)
×
=
;
(18)
+
+
=1
;
(19)
×
×5=
;
(20)(0.27+0.9)÷0.9=1.3.
(2)12×3=36;
(3)3.5-0.2=3.2;
(4)33÷1.1=30;
(5)99×6=594;
(6)0.65+2.35=3;
(7)0.1×0.03=0.003;
(8)651-105=546;
(9)2-
1 |
6 |
5 |
6 |
(10)
2 |
5 |
1 |
2 |
9 |
10 |
(11)1÷
2 |
9 |
1 |
2 |
(12)
6 |
13 |
(13)
2 |
5 |
1 |
5 |
(14)
4 |
5 |
7 |
10 |
1 |
10 |
(15)12÷
1 |
7 |
(16)2+
3 |
5 |
3 |
5 |
(17)
4 |
9 |
3 |
8 |
1 |
6 |
(18)
1 |
5 |
5 |
6 |
4 |
5 |
5 |
6 |
(19)
3 |
5 |
1 |
6 |
1 |
2 |
(20)(0.27+0.9)÷0.9=1.3.
点评:此题考查了多方面的知识:数位对齐、运算定律、运算技巧等,根据题目特点,灵活解答.
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