Odpowiedź:
[tex]1) 5a^{2} +2a-3b+3a^{2}+7a+6b\\2) 5a^{2}+2a-3b-3a^{2}-7a-6b\\3) 6ab+12a+6a-10ab=-4ab+18a\\4) -10x^{2} +2xy-8x^{2} +2xy=-18x^{2} +4xy\\5) 3x^{2} +6x+2x^{2} +x-8x-4=5x^{2} -x-4\\6) \frac{16a^{2} }{8} =16a^{2} -5\\7) \frac{-8x^{2} -20x+12xy}{4} =-2x^{2} -20x+12xy\\8) 2x^{2} +2x+y(3y)=2x^{2} +2x+3y+y^{2} =2*(2^{2})+2*2+3*1+1^{2}=2*4+4+3+1=8+8+16[/tex]
