Question

надо решить 282 и 284

Answer 1

а(b-x)=ab-ax 
x(x+y)=x²+y
(b-a)×(-2)=-2b+2a
(10-a)×4=40-4a
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c(a+1)-c=ca+c-c=ca
$frac{1}{4}$(8b-2)-1=2b-$frac{2}{4}$-1=2b-1$frac{1}{2}$
m(1+m)-(m-1)=m+m²-m+1=m²+1
$frac{1}{3}$(3k+9)-k=k+3-k=3