y=[4/(x^2)] +{9/[400-(x^2)]}讨论其单调性,并求出X值使y最小
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4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
9y=3x-(x-1),4(x+y)-(2x+4)=8y
根据3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y=
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
9(x-y)^2-12(x-y)+4=快
因式分解:4+12(x+y)+9(x-y)^2=?
(2X-3Y)(?)=-4X^+9Y^````
如果x+y/2=x-y/3=3x-2y+9/4,那么x= ,y=如果x+y/2=x-y/3=3x-2y+9/4,那么x= ,y=
(x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2
(x-4y)(2x+y)=
解二元一次方程 {3(x+y)-4(x-y)=-9 x+y/2+x-y/6=1
接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
已知4x=9y求(1)x+y/y (2)y-x/2x有关比例的
4x=9y,求x+y/y;y-x/2x请给我完整过程
x+y=5 2x+3y-z=9 x-y+z=4