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b)
c)
d) takie samo jak c(?)
e)
f)
(a-b)x(c+d)=ac+ad-bc-bd
(a-b+c)x(a+b)=a kwadrat +ab-ab-b kwadrat+ac+bc=a kwadrat -b kwadrat+ac+bc
(x kwadrat +1)(x-1)=x sześcian-x kwadrat+x-1
(2x+1)(x+1+y)=2x kwadrat+2x+2xy+x+1+y=2x kwadrat +3x+2xy+1+y