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Номер 189.

1)4(5x+9y-z)= 20x +36y-4z

2)-6(-a-8b+7c)=6a+48b-42c

3)(6p - n - 4m)×(-1,6)=-9,6p+1,6n+6,4m

4) (-2,6a-b+1,4c)×(-m)=2,6am + bm-1,4cm

5)-0,7n(7a-2,1+5k)=-4,9+1,47-3,5k

Номер 190

1) 7x+7y= 7(x+y)

2) 10ab+3bc-b=b(10a+3c-1)

3)12mp-16np=4p(3m-4n)