September 2018 1 11 Report

a) 9x(x+2)-(3x-1)(3x+1)

b) (2y+5z)(2y-5z)-5z(y-5z)

c)(2a+3b)<---do drugiej -4a(a-2b)+(a+b)(a-9b)

d) (5y-2z)(5y+2z)+4z(y+z)-25y<----do drugiej


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