2x-3y=0 3x+4y-2=0 怎么代入消元?还有3x+4y=18 2x-3y=-5

x^2-4xy+3y^2=（x-3y)(x-y)x^2-4xy+3y^2 怎么分解成（x-3y)(x-y) x^2-4Y^2+X+3Y-1=0 2X-Y-1=0 怎么算 {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 三元一次方程组x-2y=5,4x-y+3z,2x+y=0怎么解 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 x^2+4y^2-6x+4y+10=0,求x^4-y^4/(x+2y)(x-2y)*x+2y/xy^2+y^3除以（x^2+y^2/y)^2的值 x^2+2y^2-2x+y-3=0与2x^2+5y^2-4x+y-6=0 的方程组怎么解 化简求值：已知x、y满足：x^2+y^2-4x+6y+13=0 求代数式 的值.(3x+y)^2-3(3x-y)(x+y)-(x-3y)(x+3y)急用！ 二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-Y 分解因式:(x+1)(x+2)(x+3)(x+4)+1已知x*x+2x+y*y-6y+10=0 求X的Y次方已知X和Y为相反数.且XY=-1/4 求代数式x*x*x*y+2x*x*y*y+x*y*y*y的值把第一题写清楚一点哦,另外请教下,幂怎么在电脑上打出来? X×X-2XY-Y×Y+2X-2Y+2=02X×2X-4XY-2Y×2Y+3X-3Y+4=0X×X+2XY+Y×Y+X+Y-56=0X×X-2XY+Y×Y-X+Y-12=0X×X-3XY+Y×Y=-13X×3X-XY+3Y×3Y=13 两个在一起的方程之间有所联系（要求一步一步写出来） 7y(x-3y)-2(3y-x)=0 .x=?,y=? 如果A={（x,y）|x,y+2>0},B={（x,y）|2x+3y-6>0},C={（x,y）|x-4 .|x-2y-3|+|2x-y+4|=0则x=y= 已知3x-4y=0,则x^2-y^2/x^2+y^2 若2x-3y=0,求5x+4y/3x-2y