Question

計(jì)算下面各題． 8 15 × 5 8 =	14 15 × 5 21 =	27 77 × 11 18 =
2 9 × 3 7 =	4 13 × 3 8 =	5 4 × 5 4 =

Answer 1

考點(diǎn)：分?jǐn)?shù)乘法

專題：運(yùn)算順序及法則

分析：根據(jù)分?jǐn)?shù)乘法的計(jì)算法則，直接進(jìn)行口算即可．

解答： 解：

8 15 × 5 8 = 1 3	14 15 × 5 21 = 2 9	27 77 × 11 18 = 3 14
2 9 × 3 7 = 2 21	4 13 × 3 8 = 3 26	5 4 × 5 4 =1 9 16 ．

點(diǎn)評(píng)：此題考查的目的是理解掌握分?jǐn)?shù)乘法的計(jì)算法則，并且能夠正確熟練地進(jìn)行口算，提高口算能力．