若x,y同时满足5x-6y=13,3x+4y=4,求-2x+3y的值
若x、y、z满足2x+3y+z=18,4x-3y+5y=24,求x+3y的值.
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
x,y,z,满足等式3x+4y/2=6x+5y/3=4x-y+13z/2,求x+2y+z/2x+3y-z的值
若X.Y.z满足2X+3Y+z=18,4X-3Y+5z=24,求X+3Y的值
已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x:y:z的值
已知x,y,z满足方程组:4x-5y+2z=o;x+4y-3x=0,求x:y:z的值
化简求值:已知x、y满足:x^2+y^2-4x+6y+13=0 求代数式 的值.(3x+y)^2-3(3x-y)(x+y
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
若实数X,Y同时满足3x+2y=7和2x+3y=3,求x+y/x-y
已知x,y满足:x平方+y平方-4x+6y+13=0求(3x+y)-3(3x-y)(x+y)-(x-3y)(x+3y)=
设x、y是有理数,并且x、y满足等式x的平方+2y+y√3=17-4√3,求x、y的值.
已知x、y满足x的平方-4xy+4y的平方-5(x-2y)=3求2x-4y的值