{x÷7=y÷10=z÷5 ①{x+2y+3z=84 ②
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已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
{x÷7=y÷10=z÷5 ①{x+2y+3z=84 ②
(x+y+z)÷10=x+1.1 y+x=z-80+y-1 z-y=8x+y+8 x+z÷y=?
已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值
已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值
已知:4x-3y-6z=0,x+2y-7z=0.求出x-y+z÷x+y+z=?
已知方程组{4x-3y-6z=0 x+2y-7z=0 且z≠0,则(x+y+3z)÷(4x-y-5z)=?结果和思路!
2x+3y-4z=-7,(x-4z)÷3=(2y+3z)÷2=2,求X,Y,Z的值
x/10=y/5=z/7 x+y+2z=29 求x y z
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z
x+y-z=0 x+2y-z=3 2x-3y+2z=5 y÷3-x+1÷6=3 2(x-y÷2))=3(x+y÷18)
4x+9y=12 3y-2z=1 7x+5z=19÷4
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
已知x^2+4y^2-4x+4y+5=0,求(2x^2+xy-y^2分之x^4-y^4)乘以(xy-y^2分之2x-y)÷(y分之x^2+y^2)^2的值已知xyz≠0,x+3y+7z=0,3x-4y-18z=0,求(x^2+2y^2+8z^2)分之(3x^2+5y^2+6z^2)的值
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
已知1/x=5/y+z=3/z+x 求2xy/yz ÷x/Y的值
①5x-4y+4z=132x+7y-3z=193x+2y-z=18②y=2x-75x+3y+2z=23x-4z=4