V=25*10*3=750м^3
М=750*1000=750 000кг или 750тонн
S=7/4t^2*ctg(Pi/7)=7/4*1*ctg(Pi/7)=3,6339 примерно
<span>(m-148)-(97+n)=m-148-97-n=m-245-n
318-245-45=28
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m+527+293=m+820
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456-(146+m)=456-146-m=310-m
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</span>
<span>63-(25+z)=26
63-25-z=26
38-z=26
z=38-26
z=12
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(х-653)+308=417
x-653+308=417
x-345=417
x=417+345
x=762
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