4x-4y-4z=64 6y-2x-2z=64 5z+5y-3x=64
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4x-4y-4z=64 6y-2x-2z=64 5z+5y-3x=64
先化简:
x-y-z=16...........(1)
-x+3y-z=32.........(2)
-3x+5y+5z=64........(3)
(1)+(2): 2y-2z=48
y-z=24............(4)
(2)*3-(3):4y-8z=32
y-2z=8............(5)
(4)-(5): z=16
将z=16代入(4):y-16=24
y=40
将y=40,z=16代入(1):x-40-16=16
x=72
解得:x=72
y=40
z=16
(4x-4y-4z=64)*5/4=(5x-5y-5z=80)
(5x-5y-5z=80)+(5z+5y-3x=64)=(2x=144)
x=72
(4x-4y-4z=64)/4=(x-y-z=16)
y+z=56
6y-2x-2z=64 (6y-2z=64+2x=208)/2=(3y-z=104)
(y+z=56)+(3y-z=104)=(4y=160)
y=40
z=16
4x-4y-4z=64得x-y-z=16(I)
6y-2x-2z=64得3y-x-z=32(II)
5z+5y-3x=64(III)
5(i)+iii,2x=80,x=40
3(i)+ii,2x-4z=80-4z=80,z=0
y=24
x-y-z=16 得x-z=16+y
3y-x-z=32 3y-16-y=32 y=24 得x-z=40
5z+5y-3x=64 得 5z-3x=-56 得-(3x-5z)=-56 -(120-2z)=40 z=80
x=120
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