Question

直接寫(xiě)得數(shù)． 3.9×0.1=	0.02×1.4=	2.5×4.7×0.4=
7.06×100=	0.33×0.3=	0.5×0.83×2=
6.4×0.2=	0.63×0=	0.1-0.1×0.1=

Answer 1

分析：小數(shù)乘法的計(jì)算法則：按整數(shù)乘法的計(jì)算法則進(jìn)行計(jì)算，因數(shù)里面一共有幾位小數(shù)，就從積的末尾數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)．最后一題要先算乘法再算減法，據(jù)此解答．

解答：解：

3.9×0.1=0.39	0.02×1.4=0.028	2.5×4.7×0.4=4.7
7.06×100=706	0.33×0.3=0.099	0.5×0.83×2=0.83
6.4×0.2=1.28	0.63×0=0	0.1-0.1×0.1=0.09．

點(diǎn)評(píng)：本題重點(diǎn)考查了學(xué)生小數(shù)乘法的掌握情況．