x+y+z=22,3x+y=47,x=4z+2怎么解
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x+y+z=22,3x+y=47,x=4z+2怎么解x+y+z=22,3x+y=47,x=4z+2怎么解x+y+z=22,3x+y=47,x=4z+2怎么解x+y+z=22,(1)3x+y=47,(2
x+y+z=22,3x+y=47,x=4z+2怎么解
x+y+z=22,3x+y=47,x=4z+2怎么解
x+y+z=22,3x+y=47,x=4z+2怎么解
x+y+z=22,(1)
3x+y=47,(2)
x=4z+2 (3)
由(2):y=47-3x (4)
由(3)z=(x-2)/4 (5)
(4),(5)代入(1):
x+(47-3x)+(x-2)/4=22
4x+47*4-4*3x+x-2=22*4
-7x=88+2-47*4
7x=98
x=14
带回,(4)、(5):
y=47-3x
y=47-3*14
y=47-42
y=5
z=(x-2)/4
z=(14-2)/4
z=3
所以:x=14,y=5,z=3
x+y/2=z+x/3=y+z/4 x+y+z=27
(x+y-z)(x-y+z)=
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