题目内容

口算下面各题.
0.6×0.9=0.45÷0.5=0.27÷0.03=4.5×2=1.25×8=
2.5×4=7.8÷0.2=1÷0.1=10×0.01=99×0.1=
0.6×0.9=0.54,0.45÷0.5=0.9,0.27÷0.03=9,4.5×2=9,1.25×8=10,
2.5×4=10,7.8÷0.2=39,1÷0.1=10,10×0.01=0.1,99×0.1=9.9.
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