Doprowadż wyrażene do najprostszej postaci.
a) 9x(x+2)-(3x-1)(3x+1)
b) (2y+5z)(2y-5z)-5z(y-5z)
c) (2aq+3b)2-4a(a-2b)+(a+b)(a-9b)
d) (5y-2z)(5y+2z)+4z(y+z)-25y2
prosze szybko zrubcie. daje najjjjjjjjjjjjjjjj.
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