题目内容

口算
3.6÷1.8=0.24÷0.6=16.5÷0.1=0.16×0.5=0.9×0.7=2.34+3.4=
4.71-0.8=1.5×3=4.8÷0.08=16×0.01=2.5-2.5÷5=0÷3.15=

解:
3.6÷1.8=2,0.24÷0.6=0.4,16.5÷0.1=165,0.16×0.5=0.08,0.9×0.7=0.63,2.34+3.4=5.74,
4.71-0.8=3.91,1.5×3=4.5,4.8÷0.08=60,16×0.01=0.16,2.5-2.5÷5=2,0÷3.15=0.
故答案为:2,0.4,165,0.08,0.63,5.74,3.91,4.5,60,0.16,2,0.
分析:3.6÷1.8,0.24÷0.6,16.5÷0.1,.8÷0.08把被除数和除数扩大相同的倍数,然后按整数除法的法则计算;
0.16×0.5,0.9×0.7,1.5×3,16×0.01计算时,注意小数的位数;
2.34+3.4,4.71-0.8计算时注意小数点对齐;
0÷3.15根据0除以任何不为0的数,结果都为0.
点评:此题考查快速计算的能力,注意小数乘除法根据法则计算,小数加减法注意小数点对齐.
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