Question

口算

1 3 + 1 3 =	7.2÷0.3=	5 4 -1=	48+39=
1 7 + 1 5 =	1- 3 4 =	1-0.98=	25×12=
5-0.05=	4 5 + 2 5 =	1.6×0.5=	5.4÷0.9=
3 4 - 1 2 =	1 4 - 1 7 =	2.5×4=	4.3-1.9=
7.2÷6=	5 7 + 6 7 =	500-68=	3 4 + 1 4 =
1+ 5 6 =	1.4- 2 5 =	1- 4 5 =	5 9 - 2 9 =
5×1.2=	8.5-5=	8.4÷4=	37+63=
7.2+2.8=	3.99+0.01=	7 9 - 5 9 =	2+ 3 7 =
1 2 - 1 7 =	2.4+0.06=	1 5 - 1 7 =	11 12 + 1 12 =
4 5 +0.2=	5 8 - 1 8 =	8 9 - 1 9 =	1 2 - 1 3 =
0.54÷9=	1÷0.25=	0.38×2=	3 5 - 3 5 =
1 6 + 2 5 =	11 14 + 9 14 =	8.1÷0.09=	2- 1 3 =
2.5×0.6=	0.67+0.3=	12×0.5=	3.2+1.8=
0.87-0.5=	1.2÷0.3=	5 8 - 1 8 =	5 6 + 1 6 =
1 2 - 1 7 =	7×1.3+7×6.7=	3 5 + 1 6 + 5 6 =	0.8×25-10=

Answer 1

考点：分数的加法和减法,整数的加法和减法,整数的乘法及应用,小数的加法和减法,小数乘法,小数除法

专题：计算题

分析：根据分数、小数四则运算的计算法则进行口算即可，7×1.3+7×6.7利用乘法分配律简算，

3

5

+

1

6

+

5

6

利用加法结合律简算．

解答： 解：

1 3 + 1 3 = 2 3	7.2÷0.3=24	5 4 -1= 1 4	48+39=87
1 7 + 1 5 = 12 35	1- 3 4 = 1 4	1-0.98=0.02	25×12=300
5-0.05=4.95	4 5 + 2 5 =1.2	1.6×0.5=0.8	5.4÷0.9=6
3 4 - 1 2 =0.25	1 4 - 1 7 = 3 28	2.5×4=10	4.3-1.9=2.4
7.2÷6=1.2	5 7 + 6 7 = 11 7	500-68=432	3 4 + 1 4 =1
1+ 5 6 =1 5 6	1.4- 2 5 =1	1- 4 5 =0.2	5 9 - 2 9 = 1 3
5×1.2=6	8.5-5=3.5	8.4÷4=2.1	37+63=100
7.2+2.8=10	3.99+0.01=4	7 9 - 5 9 = 2 9	2+ 3 7 =2 3 7
1 2 - 1 7 = 5 14	2.4+0.06=2.46	1 5 - 1 7 = 2 35	11 12 + 1 12 =1
4 5 +0.2=1	5 8 - 1 8 =0.5	8 9 - 1 9 = 7 9	1 2 - 1 3 = 1 6
0.54÷9=0.06	1÷0.25=4	0.38×2=0.76	3 5 - 3 5 =0
1 6 + 2 5 = 17 30	11 14 + 9 14 = 10 7	8.1÷0.09=90	2- 1 3 =1 2 3
2.5×0.6=1.5	0.67+0.3=0.97	12×0.5=6	3.2+1.8=5
0.87-0.5=0.37	1.2÷0.3=4	5 8 - 1 8 =0.5	5 6 + 1 6 =1
1 2 - 1 7 = 5 14	7×1.3+7×6.7=56	3 5 + 1 6 + 5 6 =1.6	0.8×25-10=10

点评：此题考查了分数、小数四则运算的计算法则的运用，计算量较大，要细心．