Question

【题目】口算

5×0.9= 0.42÷7= 0.4÷8= 3.9×0=

86÷0.1= 30×0.05= 20+12.3= 54÷0.9=

6.3÷0.7= 9.54+0.46= 10﹣0.1= 1.5﹣0.01=

0.8×6= 3.8×0.5= 45÷0.45= 1.3+0.7=

+= += 1﹣= ﹣=

Answer 1

【答案】4.5,0.06,0.05,0,860,1.5,32.3,60,9,10,9.9,1.49,4.8,1.9,100,2，，，，

【解析】

试题分析：根据小数加减乘除四则运算和分数加减法的计算方法进行计算．据此解答．

解：5×0.9=4.5 0.42÷7=0.06 0.4÷8=0.05 3.9×0=0

86÷0.1=860 30×0.05=1.5 20+12.3=32.3 54÷0.9=60

6.3÷0.7=9 9.54+0.46=10 10﹣0.1=9.9 1.5﹣0.01=1.49

0.8×6=4.8 3.8×0.5=1.9 45÷0.45=100 1.3+0.7=2

+= += 1﹣= ﹣=