а) (a+b+c)*9=9а+9b+9с
б) -5*(m+x+k) = -5m-5х-5k
в) (4x+y-3)·(-7) = -28х-7у+21
г) (d+t-n+r)·c = cd+ct-cn+cr
д) -5,3·(0,3f-0,6f+3k) = -1,59f+3,18f-15,9k = 1,59f-15,9k
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Answers & Comments
а) (a+b+c)*9=9а+9b+9с
б) -5*(m+x+k) = -5m-5х-5k
в) (4x+y-3)·(-7) = -28х-7у+21
г) (d+t-n+r)·c = cd+ct-cn+cr
д) -5,3·(0,3f-0,6f+3k) = -1,59f+3,18f-15,9k = 1,59f-15,9k