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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a) 9x^ + 18x - 9x^ +1= 18x+1
b) 4y^ - 25z^ - 5zy + 25z^ = 4y^ - 5zy
c) 4a^ + 12ab + 9b^ - 4a^ + 8ab + a^ + 9ab +ab - 9b^ = a^ + 29ab
d) 25y^ - 4z^ + 4zy + 4z^ - 25y^ = 4zy
^- do potęgi drugiej ;)