Question

9 10 ×30=	5× 3 5 =	3 4 + 1 8 =	8 15 × 5 8 =	1-1× 11 21 =
7 11 × 2 3 =	12× 1 6 =	2 9 × 3 7 =	4 13 × 3 8 =	8 25 × 5 4 =

Answer 1

考點(diǎn)：分?jǐn)?shù)乘法

專題：運(yùn)算順序及法則

分析：分?jǐn)?shù)乘整數(shù)，用分?jǐn)?shù)的分子和整數(shù)相乘的積做分子，分母不變；分?jǐn)?shù)乘分?jǐn)?shù)，用分子相乘的積做分子，分母相乘的積做分母，能約分的要約分；先算乘除，后算加減，據(jù)此解答即可．

解答： 解：

9 10 ×30=27	5× 3 5 =3	3 4 + 1 8 = 7 8	8 15 × 5 8 = 1 3	1-1× 11 21 = 10 21
7 11 × 2 3 = 14 33	12× 1 6 =2	2 9 × 3 7 = 2 21	4 13 × 3 8 = 3 26	8 25 × 5 4 = 2 5

點(diǎn)評(píng)：此題主要考查分?jǐn)?shù)乘整數(shù)，分?jǐn)?shù)乘分?jǐn)?shù)的運(yùn)算法則的靈活應(yīng)用，以及學(xué)生的口算能力．