Можете сделать примеры.27000:_⋅2=_:50⋅_=_ Это следущий _ ⋅500=_ ⋅1000:2=12000
_:500=-_:1000⋅ 2=18
_⋅5=_ ⋅10:2=2400
_⋅5=_ ⋅10:2=420
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