Question

4分鐘口算

2.5×4=	505×2=	0.3× 1 3 =	1 5 ÷0.5=	4.8- 4 5 =
1.25+3 3 4 =	3-1÷3=	2000×1 1 2000 =	2.4+ 2 3 =	23=
40-18=	100×0.06=	3 5 × 1 2 =	2.5×4=	4-3 9 20 =
2 5 + 1 10 =	1÷1 2 7 =	1.8× 5 6 =	3÷4=	1 7 8 +0.125=

Answer 1

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

專(zhuān)題：運(yùn)算順序及法則

分析：運(yùn)用整數(shù)、小數(shù)、分?jǐn)?shù)的加減乘除法的計(jì)算法則進(jìn)行計(jì)算，不能化成有限小數(shù)的寫(xiě)成分?jǐn)?shù)的形式．

解答：

解：2.5×4=10 505×2=1010 0.3× 1 3 =0.1 1 5 ÷0.5=0.4 4.8- 4 5 =4 1.25+3 3 4 =5 3-1÷3= 8 3 2000×1 1 2000 =2001 2.4+ 2 3 = 46 15 23=8 40-18=22 100×0.06=6 3 5 × 1 2 = 3 10 2.5×4=10 4-3 9 20 = 11 20 2 5 + 1 10 =0.5 1÷1 2 7 = 7 9 1.8× 5 6 = 3 2 3÷4=0.75 1 7 8 +0.125=2

點(diǎn)評(píng)：本題運(yùn)用整數(shù)、小數(shù)、分?jǐn)?shù)的加減乘除法的計(jì)算法則進(jìn)行計(jì)算．