Question

直接寫出得數(shù)． 2 3 + 1 4 =	2 5 - 2 9 =	42× 1 2 =	2 5 ÷ 7 10 =	2 3 × 3 10 =
3 4 × 2 5 × 4 3 =	8× 3 8 +8× 1 8 =	55× 1 11 ÷ 1 8 =	3 5 ÷ 9 10 =	13 9 -（ 2 5 + 4 9 ）=

Answer 1

考點(diǎn)：分?jǐn)?shù)的加法和減法,分?jǐn)?shù)乘法,分?jǐn)?shù)除法

專題：計算題

分析：根據(jù)分?jǐn)?shù)加減乘除法的計算方法進(jìn)行計算；
8×

3

8

+8×

1

8

根據(jù)乘法分配律進(jìn)行簡算．

解答： 解：

2 3 + 1 4 = 11 12	2 5 - 2 9 = 8 45	42× 1 2 =21	2 5 ÷ 7 10 = 4 7	2 3 × 3 10 = 1 5
3 4 × 2 5 × 4 3 = 2 5	8× 3 8 +8× 1 8 =4	55× 1 11 ÷ 1 8 =40	3 5 ÷ 9 10 = 2 3	13 9 -（ 2 5 + 4 9 ）= 3 5

點(diǎn)評：口算時，注意運(yùn)算符號和數(shù)據(jù)，然后再進(jìn)一步計算．