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
6
=
2
5
+
1
2
=
2
9
=
6
13
×26=
2
5
÷
1
5
=
4
5
-
7
10
=
12÷
1
7
×0=
2+
3
5
=
4
9
×
3
8
=
1
5
+
5
6
+
4
5
=
3
5
×
1
6
×5=
(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.
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
6
=1
5
6

(10)
2
5
+
1
2
=
9
10

(11)1÷
2
9
=4
1
2

(12)
6
13
×26=12;
(13)
2
5
÷
1
5
=2;
(14)
4
5
-
7
10
=
1
10

(15)12÷
1
7
×0=0;
(16)2+
3
5
=2
3
5

(17)
4
9
×
3
8
=
1
6

(18)
1
5
+
5
6
+
4
5
=1
5
6

(19)
3
5
×
1
6
×5=
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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