已知x,y满足x²-4xy+4y²-5(x-2y)=3,求2x-4y值
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已知x,y满足x²-4xy+4y²-5(x-2y)=3,求2x-4y值
已知x,y满足x²-4xy+4y²-5(x-2y)=3,求2x-4y值
已知实数x,y满足x²+4xy+4y²-x-2y+1/4=0 ,则x+2y 的值为?
已知实数x、y满足x²+4xy+4y²-x-2y+4分之1=,则x+2y的值,
已知x,y满足x²+y²+17÷4=4x+y,求代数式xy÷(x+y)的值
已知非零实数x,y满足x²-4xy+4y²=0,求分式2x-y除以2x+y的值
已知实数x、y满足x²+4xy+4y²-x-2y+四分之一=0,则x+2y的值为
已知实数x、y满足5x²-3xy+1/2y²-2x+1/2y+1/4=0 求x、y的值
已知实数x、y满足5x²-3xy+1/2y²-2x+1/2y+1/4=0 求x、y的值
已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² + xY- 2Y² =求x² - 4x Y+ Y² =
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y²-y+17/4=0已知、x+y=6且xy=4(1)x²+y² (2)(x-y)² (3)x{四次方}+y{四次方}第一题没错 书上就这样写的!
已知实数x,y满足x²+4y²=4.求f(x,y)=x²+2xy+4y²+x+2y的最大值
已知x,y满足x²+y²-4x-6y+13=0,求(-y/x³)³÷(-1/xy)四次方×(x/y²)²
已知2x+3y=0,求代数式1.5x+4y/3x-2y 2.x²+xy-y²/x²-xy+y²
已知xy=8满足x²-xy-x+y=56,求x²+y²的值
1·已知a+b+c=0且a²+b²+c²=1,求ab+bc+ac的值.2·已知x,y满足等式x²+y²-4x+y+17/4=0,求(x+y)²的值.3·已知x+y=5,x²+y²=13,求代数式x²y+2x²y²+xy²的值.4·若a²+b²+
已知xy=8满足x²y-8xy²-x+y=56,求x²+y²的值-8xy²
4x²y-xy²