Question

直接写出得数． 8÷ 1 4 =	3 5 ×3=	5 8 ×4=	（ 1 3 + 3 4 ）×12=
4 9 × 2 3 =	4 9 + 2 3 =	2 3 ÷ 3 2 =	3 4 + 1 4 ×3=
12× 3 4 =	12÷ 3 4 =	12+ 3 4 =	1 3 × 1 4 ÷ 1 3 × 1 4 =
2.44-0.1=	4.2÷0.3=	15×30%=	5 6 ÷ 3 5 ÷ 5 2 =
0.52=	1 5 + 1 4 =	12- 3 4 =	40÷40%=

Answer 1

分析：本题根据分数加法、减法、乘法、除法，小数的加法、除法的运算法则计算即可．
（

1

3

+

3

4

）×12可据乘法分配律计算，

1

3

×

1

4

÷

1

3

×

1

4

可根据乘法交换律计算．

解答：解：

8÷ 1 4 =32	3 5 ×3= 9 5	5 8 ×4= 5 2	（ 1 3 + 3 4 ）×12=13
4 9 × 2 3 = 8 27	4 9 + 2 3 = 10 9	2 3 ÷ 3 2 = 4 9	3 4 + 1 4 ×3= 3 2
12× 3 4 =9	12÷ 3 4 =16	12+ 3 4 =12 3 4	1 3 × 1 4 ÷ 1 3 × 1 4 = 1 16
2.44-0.1=2.34	4.2÷0.3=14	15×30%=4.5	5 6 ÷ 3 5 ÷ 5 2 = 5 9
0.52=0.25	1 5 + 1 4 = 9 20	12- 3 4 =11 1 4	40÷40%=100

点评：完成此类题目要细心，在保证做题质量的同时，要注意提高做题的速度．