Question

口算． 6.3÷O.21=	3.9÷0.13=	1.1×1.1=	0.6×0.7=
0.9-0.32=	1.59+5.31=	1.25×O.8=	6.5÷0.5=
0.78÷2=

Answer 1

分析：根據(jù)小數(shù)加減乘除法的計(jì)算方法進(jìn)行計(jì)算．

解答：解：

6.3÷O.21=30	3.9÷0.13=30	1.1×1.1=1.21	0.6×0.7=0.42
0.9-0.32=0.58	1.59+5.31=6.9	1.25×O.8=1	6.5÷0.5=13
0.78÷2=0.39

點(diǎn)評(píng)：口算時(shí)，注意運(yùn)算符號(hào)和數(shù)據(jù)，然后再進(jìn)一步計(jì)算．