October 2018 2 11 Report

a) 5(2+x)2+(4-x)(4+x)-2(1-x)2

b) (2x+y)2-3(x-y)2+(-2x-3y)(-2x+3x)

c) (a-2)2-(a+2)2-(2a-3)2

d) (a-2)2+(a+1)2-(a-1)2 dla a= 2

e) (a-b)2+2(a+b)(a-b)=3(a+b)2 dla a= √-3 dla b= √2

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