-(3x-2y-z)-2(4x-3(x-2y-z)-2)
1个回答
-(3x-2y-z)-2(4x-3(x-2y-z)-2)
=-3x+2y+z-2(4x-3x+6y+3z-2)
=-3x+2y+z-8x+6x-12y-6z+4
=-5x-10y-5z+4
相关问题
x+2z=3 x+y+z=2 2x+y=2 3x-y-4z=5 2y+z=7 2x+3y-2z=0
证明:(y+z-2x)3+(z+x-2y)3+(x+y-2z)3=3(y+z-2x)(z+x-2y)(x+y-2z).
2x-y=7 x+y+z=25x+3y+z=2 x-2y+z=-1 3x-4z=4 x+2y+3z=-1x+y-z=6x
x+y+z=3,3x-y-4z=-2,2x+3y-2z=3
x,y,z满足x+y+z=3,x^2+y^2+z^2=29,x^3+y^3+z^3=45,求x,y,z,x^4+y^4+
x+y+z=2 ① 2x+3y+z=38 ① x+y=3 3x-y-4z=5 ② 3x+4y+2z+56 ② y+z=5
已知x+y+z=1 x2+y2+z2=2 x3+y3+z3=3 求x4+y4+z4=?
2x+y-z=2 x+2y+z=4 x-2y+3z=2
(1)3x+4y=15 2y-z=2 x+2z=9 (2) x+y+z=8 2x+3y-z=6 3x-y+z=8 (3)
2x+y=3 3x-y-2z=-2 x+y-z=4