Question

口算

4m+3.2m=	5a+a=	3a-5a=	3k-1.3k=	100×1.8%=
0.5×50%=	11 12 - 7 12 =	6÷0.5=	2+11× 2 11 =	5 6 ÷30=
11×10 1 11 =	2 1 3 × 6 7 =	25÷ 1 4 =	16×0.5=	1 2 ÷ 1 8 =
1 2 + 1 3 =	1 1 2 -1 1 2 ÷1 1 2 =	3÷ 1 5 - 1 5 ÷3=	3 5 + 5 9 - 3 5 + 5 9 =	0.25×32×0.125=

Answer 1

考點：分數(shù)的加法和減法,分數(shù)除法

專題：運算順序及法則

分析：直接按照整數(shù)、小數(shù)、分數(shù)四則運算的計算法則和混合運算的順序得出答案即可．

3

5

+

5

9

-

3

5

+

5

9

利用加法交換律與結合律簡算，0.25×32×0.125利用乘法交換律與結合律簡算．

解答：

解：4m+3.2m=7.2m	5a+a=6a	3a-5a=-2a	3k-1.3k=1.7k	100×1.8%=1.8
0.5×50%=0.25	11 12 - 7 12 = 1 3	6÷0.5=12	2+11× 2 11 =4	5 6 ÷30= 1 36
11×10 1 11 =111	2 1 3 × 6 7 =2	25÷ 1 4 =100	16×0.5=8	1 2 ÷ 1 8 =4
1 2 + 1 3 = 5 6	1 1 2 -1 1 2 ÷1 1 2 = 1 2	3÷ 1 5 - 1 5 ÷3=14 2 5	3 5 + 5 9 - 3 5 + 5 9 = 10 9	0.25×32×0.125=1

點評：掌握四則運算的計算法則和混合運算的順序是解決問題的關鍵．