已知2x-3y=0,求(2x^2-3y^2)/(3x^2-2xy)的值

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/01 08:18:44
已知2x-3y=0,求(2x^2-3y^2)/(3x^2-2xy)的值
x){}K*t+m tml0345AlJZ6I*'Q~ 9X0{7UWB8F0)&em)~(V?X$ Ъ*!@jʆ0U`U@`Pq@APZ&~qAb4`lY3

已知2x-3y=0,求(2x^2-3y^2)/(3x^2-2xy)的值
已知2x-3y=0,求(2x^2-3y^2)/(3x^2-2xy)的值

已知2x-3y=0,求(2x^2-3y^2)/(3x^2-2xy)的值
解由2x-3y=0,
即2x=3y
得x=3/2y
即(2x^2-3y^2)/(3x^2-2xy)
=[2（3/2y）^2-3y^2]/[3(3/2y)^2-3y*y]
=[9/2y^2-3y^2]/[27/4y^2-3y²]
=[3/2y^2]/[15/4y^2]
=(3/2)/(15/4)
=3/2*4/15
=2/5

解由2x-3y=0,
即2x=3y
得x=3/2y
即(2x^2-3y^2)/(3x^2-2xy)
=[2（3/2y）^2-3y^2]/[3(3/2y)^2-3y*y]
=[9/2y^2-3y^2]/[27/4y^2-3y²]
=[3/2y^2]/[15/4y^2]
=(3/2)/(15/4)
=3/2*4/15
=2/5

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y) 已知x+y=0,求x^3+x^2*y+xy^2+y^3 已知4x-2y=0,求x-y/3x+2y的值 已知(x+y)^(2)+(x+3y-4)^(2)=0,求x,y的平方和 已知x=2y,求2x-y分之x-3y的值.0 已知|2x-3y|+|3x-y-1|=0,求x,y的值. 已知2x²-xy-3y²=0,求x-y/x+y 已知|x+y|+(x-y+3)^2=0,求x,y的值 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y 已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值 已知x^2-3y^2=2xy(x>0,y>0),求代数式x+2y/x-y 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)*(x-y)的值. 已知x-3y=0,求2x+y/x-2xy+y乘(x-y)的值