Odpowiedź :
Odpowiedź:
[tex]Zad.1\\\\4(5a-2b+7)-6(3a-5b+4)=20a-8b+28-18a+30b-24=2a+22b+4\\\\\\8x(3y-4x+0,5)+9y(3x+6-2y)=24xy-32x^2+4x+27xy+54y-18y^2=\\\\=51xy-32x^2+4x+54y-18y^2\\\\\\0,5a(10a+12ab-8b)-(9ab+4a^2-5a^2b)=5a^2+6a^2b-4ab-9ab-4a^2+5a^2b=\\\\=a^2+11a^2b-13ab[/tex]
[tex]Zad.2\\\\P=4x\ \ ,\ \ Q=7x+4y+11\ \ ,\ \ R=-3x+8y-6\\\\\\a)\ \ P\cdot R+Q\\\\4x(-3x+8y-6)+7x+4y+11=-12x^2+32xy-24x+7x+4y+11=\\\\=-12x^2+32xy-17x+4y+11\\\\\\b)\ \ Q-R\\\\7x+4y+11-(-3x+8y-6)=7x+4y+11+3x-8y+6=10x-4y+17[/tex]