28\x+30\z+35\y=4.5 28\y+30\z+35\x=4.3 x+y+z=142 帮我解.马上!
28\x+30\z+35\y=4.5 28\y+30\z+35\x=4.3 x+y+z=142 帮我解.马上!
x/30+y/28+z/35=4.5 x/30+y/35+z/28=4.7 x+y+z=142 这个方程怎么解?
x+y+z=142 x/28+y/30+z/35=4.5 z/28+y/30+x/35=4.7 怎么解.
解三元一次方程组1.x+y+z=142 30/x+28/y+35/z=4.5 30/x+35/y+28/z=4.7
解方程组:x/28+y/35+z/30=4.5①;x/35+y/28+z/30②;x+y+z=142③
x*(y-Z)=27,y*(x-Z)=35,Z*(x+y)=28三个方程正整数解
(x+y-z)(x-y+z)=
求解三元一次方程组,x+y+z=142 x/30+y/28+z/35=4.5
帮我解方程组:3x-y+z=3,2x+y-3z=11,x+y+z=12.x=?y=?z=?
(20%x+30%y+45%z)/(x+y+z)=35%这个方程怎么解?
X+Y+Z=?
f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)