合并下列各式的同类项 1.-(5x-y-2z)-3[4x-(x-y-z)+2y]
已知x/2=y/3=z/4,求下列各式 (1)(x+y+z)/x (2)(x-y+2x/(x-y-2z)
已知3X-4Y-Z=0,2X+Y-8Z=0,求下列各式的值:
将下列各式合并同类项:(1)-x-x-x (2)2x的平方-3x的平方y+5x的平方y
合并同类项 2x—3(x—2y+3z)+2(3x—3y+2x)
1.(x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2)
合并同类项:- 2(x-y)的平方- 3(x-y)+5(y-x)的平方+4(y-x)
合并同类项:-3x+2y-5x-7y
3x+2y-5(x+y)合并同类项
已知x+y+z=0,x^2 + y^2 + z^2 = 1 ,试求下列各式的值:
3(x-y)-2(x+y)-5(x-y)+4(x+y)+3(x-y) 化简合并同类项
x/3=y/4=z/5,求x+y+z/3x-2y+z的值,
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.