1/2 = 0,5 . Ответ: -(7m+13n)
6* 1/2 (m-n) - 20*0,5(m+n)=3*(m-n)-10(m+n) = 3m - 3n - 10m - 10n= -7m-13n
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1/2 = 0,5 . Ответ: -(7m+13n)
6* 1/2 (m-n) - 20*0,5(m+n)=3*(m-n)-10(m+n) = 3m - 3n - 10m - 10n= -7m-13n