- cloudcone
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解:
因为1cm2=10-4m2,所以200cm2=200×10-4m2=0.02m2;
因为1km/h=
1
3.6
13.6m/s,所以144km/h=144×
1
3.6
13.6m/s=40m/s.
故答案为:0.02;40.
解:
因为1cm2=10-4m2,所以200cm2=200×10-4m2=0.02m2;
因为1km/h=
1
3.6
13.6m/s,所以144km/h=144×
1
3.6
13.6m/s=40m/s.
故答案为:0.02;40.