急 2x∧2-4x-2.5=0 -y∧2+2y+3=0 (x-1)∧2-2(x-1)-3=0
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知实数x满足x+1/x=3,求x-1/x的值 如果x平方+y平方-4x-2y+5=0,则(根号x)+y/(根号x)-y
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
(x+y)-(x+y)平方 因式分解 解方程 2x²=3x (3x-1)² - 4=0 5x-15x
3X-2y-[-4x+(y+3x)]-(2x-3y)其中|x+1|+(y+2分之1)的平方=0 先化简在求值
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
dx/dy=x/y+[cos(x/y)]∧2,y(0)=1
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值
已知4x^2+y^2-4x-6y+10=0,求(2\3x根号9x+y^2根号x/y^3)-(x^2根号(1\x)-5x根