口算.40×60=100×5=480÷6=648÷2=23×30=0×451=0÷47=4.9-4.5=603÷3=0.6+2.4=30×50=2-1.6=

发布时间:2020-08-07 18:45:31

口算. 40×60=100×5=480÷6=648÷2=23×30=0×451=0÷47=4.9-4.5=603÷3=0.6+2.4=30×50=2-1.6=

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解:40×60=2400,100×5=500,480÷6=80,648÷2=324,23×30=690,0×451=0,0÷47=0,4.9-4.5=0.4,603÷3=201,0.6+2.4=3,30×50=1500,2-1.6=0.4,故
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