Question

給等號(hào)右邊的數(shù)點(diǎn)上小數(shù)點(diǎn)，使結(jié)果正確． 8.4×12=1008	0.36×23=828
0.065×24=1560	1．O2×38=3876．

Answer 1

分析：積的小數(shù)點(diǎn)位數(shù)是所有因數(shù)的小數(shù)點(diǎn)位數(shù)之和，據(jù)此可以解決．

解答：解：由分析可知：
8.4×12=100.8；
0.36×23=8.28；
0.065×24=1.560；     
1．O2×38=38.76．

點(diǎn)評(píng)：本題考查了積的變化規(guī)律，解決本題的關(guān)鍵是學(xué)生要明確積的小數(shù)點(diǎn)位數(shù)與各因數(shù)的小數(shù)點(diǎn)位數(shù)之間的關(guān)系．