y=3-x-x^2,where it crosses the Y-axisy=3-x-x^2,where it crosses the Y-axis...Question:find the equations of the tangent and normal to the curves

y=3-x-x^2,where it crosses the Y-axisy=3-x-x^2,where it crosses the Y-axis...Question:find the equations of the tangent and normal to the curves Where is the assignment operator used?Here myclass is a class.a) int x,y = x; b) myclass x,y = x; c) myclass x,y(x); d) myclass x,y; x = y 如果A={（x,y）|x,y+2>0},B={（x,y）|2x+3y-6>0},C={（x,y）|x-4 P=2r-4,where r P=2r-4,where r =3N=4(y-5),where y=2S=ma+2,where m=6 and a=-7A=三分之一(x+y),where x=7 and y=5以及答案是什么 设集合A={x|x=y^2-2y-8},B={x|y=-x^2+2x+3},C={y|y+1 （x+y）^2-z^=a^2-(b-c)^2=(x-y)^3-x+y=16(x+y)^2-25(x-y)^2= 已知x/y+z=y/x+z=z/x+y,分式(x+2y+3z)/(2x+5y-2c)有意义时的值 曲线C：2x^+y^-x+2y-3=0关于y轴对称 设A={(x,y)}|3x+2y|.设A={(x,y)}|3x+2y|.B={(x,y)|x-y=2|},C={(x,y)|2x-2y|=3},D={(x,y)|6x+4y=2|},求A∩B,B∩C,A∩D设A={(x,y)|3x+2y=1}.B={(x,y)|x-y=2},C={(x,y)|2x-2y=3},D={(x,y)|6x+4y=2},求A∩B，B∩C，A∩D 3^x+2x=y,x (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 下列格式中.计算正确的是A.(x^2-y^2)/(x-y)=x-yB.(x^3-y^3)/(x-y)=x^2+xy+y^2C.(x+y)^2/(x+y)=x-yD.(x+y)^3/(x+y)=x^2+xy+y^2 已知A=3x^2-12,B=5x^2*y^3+10x*y^3,C=(x+1)(x+3)+1求其公因式已知A=3x*x-12,B=5x*x*y*y*y+10x*y*y*y,C=(x+1)(x+3)+1求其公因式,若无,说出理由 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 几道 数学题急啊 对了再加20分(x+y)^2-(x+y)^3(x-y)^2-(x-y)^3 (x-y)^2-(y-x)^32(x-y)-3(y-x)^24ab(a+b)^2-6a^2b(a+b)(x+y)(x-y)-(x+y)^28a(x-y)^2-4b(y-x)a=-5 a+b+c=-5.2求代数式a^2(-b-c)-3.2a(c+b)的值 (x+y)(2x-3y)=? 3/X+2/Y=6/1等介于?（X不等于18）A.x/3+y/2=1/6 B .3Y+2X C.X=18Y/Y-12 D .Y=12X/X-18