3м=300см
3+5+7=15
300:15=20
20*3=60см
20*5=100см
20*7=140см
60+100+140=300см=3м
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3м=300см
3+5+7=15
300:15=20
20*3=60см
20*5=100см
20*7=140см
60+100+140=300см=3м