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100см-60см=40см 9см+20см=29см 8см+41см=49см 1000см-500см=500см 50см-170см+710см=590см
600г. + 1,5кг(1500г.) + 900 г. = 3000г. или 3кг
Ответ
Используя почленное деление получим это