a) 5(x+2y)-6(x-3y)+7(3x+y)= b) (x kwadrat +x-1)*4+16(x-x kwadrat ) -5(8-x+2x kwadrat ) c) x kwadrat (5x kwadrat -3) (x+7)-x(x szescian +3x kwadrat-4x+1) d) (x-5/6) + (x+6/5) * 30 e) [12(xy-1)-18(2+x)] : (-6) Kwadrat znaczy te 2 Szescian znaczy te

a) 5(x+2y)-6(x-3y)+7(3x+y)=5x+10y-6x+18y+21x+7y=20x+35y b) (x²+x-1)*4+16(x-x²)-5(8-x+2x²)=4x²+4x-4+16x-16x²-40+5x-10x²=-22x²+25x-44 c) x²(5x²-3)(x+7)-x(x³+3x²-4x+1)=x²(5x³+35x²-3x-21)-x do czwartej+3x³-4x²-x=5x do piątej+35x do czwartej-3x³-21x²-x do czwartej+3x³-4x²-x=5x do piątej+34x do czwartej-25x²-x d) (x-5/6)+(x+6/5)*30=x-5/6+30x+36=31x+35 1/6 e) [12(xy-1)-18(2+x)]:(-6)=[12xy-12-36-18x]:(-6)=[12xy-18x-48]*(-1/6)=-2xy+3x+8