Question

口算大家練． 0.2×0.3=	1.7×0.4=	0.5×0.8=
1.4×0.5=	0×3.5=	9×0.008=

Answer 1

分析：本題根據(jù)小數(shù)乘法的運(yùn)算法則計(jì)算即可．
小數(shù)乘法法則：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(diǎn)上小數(shù)點(diǎn)． 得數(shù)的小數(shù)部分末尾有0，一般要把0去掉．

解答：解：

0.2×0.3=0.06	1.7×0.4=0.68	0.5×0.8=0.4
1.4×0.5=0.7	0×3.5=0	9×0.008=0.072

點(diǎn)評：在完成小數(shù)乘法算式時，要注意小數(shù)點(diǎn)位置的變化．