a) 4(m-3)=4m-12
(a+b)9=9a+9b
5(1+k+n)=5+5k+5n
б) (k+5)y=yk+5y
7(m-n)=7m-7n
(a+b+1)c=ac+bc+c
в) n(1-x)=n-nx
(b+c)d=bd+cd
(m+3+n)8=8m+24+8n
г) a(b+2)=ab+2a
2(a+2)=2a+4
b(a+1)=ab+b
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Answers & Comments
a) 4(m-3)=4m-12
(a+b)9=9a+9b
5(1+k+n)=5+5k+5n
б) (k+5)y=yk+5y
7(m-n)=7m-7n
(a+b+1)c=ac+bc+c
в) n(1-x)=n-nx
(b+c)d=bd+cd
(m+3+n)8=8m+24+8n
г) a(b+2)=ab+2a
2(a+2)=2a+4
b(a+1)=ab+b