3(0,6m+5n)-3n=3*0.6m +15n-3n=1.8m+12n=6*(0.3m+2n)
при 0.3m+2n=4
=6*4=24
Ответ: 24.
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3(0,6m+5n)-3n=3*0.6m +15n-3n=1.8m+12n=6*(0.3m+2n)
при 0.3m+2n=4
=6*4=24
Ответ: 24.