1cm=10mm
1m=100cm=1000mm
1km=1000m=100000cm=1000000mm
より、=の右側は、
①1m1cm
②2cm1mm
③5km3m
④1m95cm
だから、
①1m+1cm
②2cm+1mm
③5km+3m
④2m-5cm
となります。
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