Question

直接寫得數(shù)． 3.6×2=	0.64÷0.8=	5.78×0=	0.7×0.6=
0.36+0.14=	7×0.06=	4.2×0.1=	1.8÷0.2=

Answer 1

分析：小數(shù)乘法：先按整數(shù)乘法的法則算出積，再看因數(shù)中一共有幾位小數(shù)，就從得數(shù)的右邊起數(shù)出幾位，點上小數(shù)點；
除數(shù)是小數(shù)除法：先把除數(shù)的小數(shù)點向右移動幾位，使除數(shù)變成整數(shù)，除數(shù)的小數(shù)點向右移動幾位，就把被除數(shù)的小數(shù)點也向右移動幾位，再照除數(shù)是整數(shù)的小數(shù)除法計算；
小數(shù)加法：把小數(shù)點對齊，從低位加起．

解答：

解： 3.6×2=7.2	0.64÷0.8=0.8	5.78×0=0	0.7×0.6=0.42
0.36+0.14=0.5	7×0.06=0.42	4.2×0.1=0.42	1.8÷0.2=9．

點評：此題考查了基本的小數(shù)四則運算，計算時要細心，注意得數(shù)的小數(shù)點的位置．