写纸上,拍下来.

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写纸上,拍下来.
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写纸上,拍下来.
写纸上,拍下来.
 

写纸上,拍下来.

(1)3x+2y+5z+x-2y-z=2+6
4x+4z=8
x+z=2
(2)x-2y-z+4x+2y-7z=6+30
5x-8z=36
(1)乘以8+(2)
8x+8z+5x-8z=2*8+36
13x=52
x=4
x+z=2,x=4,所以z=-2,y=0