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Ответ:
And this base's area is 5x5=25
Following the theorem of Pitagor we find out the high of this pyramid is √(5²-(5/2)²)=5√3/2
The volume of this pyramid is V1= 1/3x5√3/2x25= 125√3/6
And the volume of the rectangular is 4x5x12=240
We do the addition 125√5/3+ 240
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