Помогите пожалуйста : а) 3м9дм=() дм=() см
548см=()м()дм()см
80см=()мм

5ч20мин=()мин
1км=()м
9м8дм=()дм


а) 3м21см+4м99см=
2ц49кг+5ц6кг=
1т-584кг=
9ц-268кг=
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