Question

直接寫得數(shù)． 2 5 + 1 2 =	3 1 4 +1.75=	3 5 ÷ 1 3 =	1 8 × 1 8 =
6 7 × 7 15 =	5 6 - 1 2 =	1 4 + 1 5 =	7× 3 14 =
6 7 ÷6=	4 5 ÷ 5 4 =	3÷ 1 3 =	52× 4 13 =
1 8 ÷ 5 2 =	1 2 × 1 3 ÷ 1 3 × 1 2 =	2 3 ×0+3=	4×（ 1 12 + 1 4 ）=

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：按照分數(shù)四則運算的計算法則，混合運算的運算順序直接計算得出答案即可．4×（

1

12

+

1

4

）利用乘法分配律簡算．

解答：

解： 2 5 + 1 2 = 9 10	3 1 4 +1.75=5	3 5 ÷ 1 3 = 9 5	1 8 × 1 8 = 1 64
6 7 × 7 15 = 2 5	5 6 - 1 2 = 1 3	1 4 + 1 5 = 9 20	7× 3 14 = 3 2
6 7 ÷6= 1 7	4 5 ÷ 5 4 = 16 25	3÷ 1 3 =9	52× 4 13 =16
1 8 ÷ 5 2 = 1 20	1 2 × 1 3 ÷ 1 3 × 1 2 = 1 4	2 3 ×0+3=3	4×（ 1 12 + 1 4 ）=1 1 3

點評：掌握運算法則和混合運算的順序是正確計算的關(guān)鍵，注意計算結(jié)果的化簡．