前列腺疼痛难忍怎么办:(5x+4y-2z)(5x-4y-2z)=?
来源:百度文库 编辑:神马品牌网 时间:2024/10/06 18:40:37
(5x+4y-2z)(5x-4y-2z)=?
(5x+4y-2z)(5x-4y-2z)
=[(5x-2z)+4y][(5x-2z)-4y]
=(5x-2z)^2-(4y)^2
=25x^2-20xz+4z^2-16y^2
=(5x-2Z)^2-16Y^2=25X^2-20XZ+4Z^2-16Y^2
2x+Y+3z=23,x+4y+5z=36,求X+2Y+3z~~~~
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
13x+5y+9z=12.7 2x+4y+3z=4.7 x+y+z=?
(5x+4y-2z)(5x-4y-2z)=?
若2x 5y 4z=0,则x y-z值是多少?
已知3x-z=x+y+z=4x+2y-z,求x : y : z
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-9z*z的值。
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z都不为0,求(3x*x+y*y+4z*z)/(5x*x+y*y-9z*z)的值
设x:y:z=2:3:5,且满足3x-3y+z=4,求2x+3y-4z的值.