x^11*x^12*x=x^24y^15:y^3=y^12(xyz)^4=x⁴y⁴z⁴(3ab-5a-b)-(12ab-3a)=3ab-5a-b-12ab+3a=-9ab-2a-b 2x^2(3-5x^2)=6x²-10x⁴(2a+b)(2a-b)=4a²-b²(3x+y)^2=9x²+6xy+y²(x^2+y^2)^2=x⁴+2x²y²+y⁴ (a-4)(a-2)+(a+1)(a+3)=a²-2a-4a+8+a²+3a+a+3=2a²-2a+1114a^4b/49a^3b^2=2a/7by^2-z^2/2y+2z=(y-z)(y+z)/2(y+z)=(y-z)/2 (a/a+4-a/a-4)*a+4/a=a/a*a+4a-a/a*a-4a+4/a=a-a+4/a=4/a(y^2-2y)^2-y^2(y+3)(y-3)+2y(2y^2+5)=y⁴-4y³+4y²-y²(y²-9)+4y³+10y=y⁴+4y²-y⁴+9y²+10y=3y⁴+12y²+10y