在4x^2+12x+|2y-6|=-9的条件下,x^y=
已知2x+y=-6,x-3y=4,在不解方程组的条件下,求7y(x-3y)^2-2(3y-x)^3
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
已知y=x²-2x+1/x²-1÷x²-x/x+1 × 5x,试说明在代数式有意义的条件下
已知2x+y=6,x-3y=1,在方程组的条件下,求7y(x-3y)²-2(3y-x)三次方的值
已知P=X+Y,Q=(X-Y)(X-Y)-2Y(X+Y).小敏、小聪两人在X=2,Y=-1的条件下分别计算了P和Q的值.
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
已知4x=9y求(1)x+y/y (2)y-x/2x
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20