若y-2x=3,则2(y-2x)-4(2x-y)的二次方+6x-3y的值为______.A.81 B.90 C.9 D-90
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/29 02:37:28
x){ѽRרXiL{:@{:uMl
J 'zYlNm
]Jӆ=Ov=G=C'=Kg=K]K"}_`g3$6HWSDO3,gօbu!1DLH¶/.H̳ C
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
若|x-3|+(y+2)=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是
若|x-3|+(y+2)²=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是
若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是()?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8?(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8
若2x=3y,则(x*x+y*y)/x*x=?
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若5x+3y=3x+4y=x+2y+6,则x+y=___
若x/y=4/3 则3x+2y/2x-5y=
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)=
若实数x,y满足x的平方+y的平方-4x-2y+5=0,则(x+y)/2x-3=
2x-y/x+y=4,则4x-2y/2x+2y+3x+3y/2x-y