解方程组:I.x+2y-z=6 2x+y+z=9 3x+4y+z=18 II.x-y=3 x²-y²=18

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解方程组:I.x+2y-z=62x+y+z=93x+4y+z=18II.x-y=3x²-y²=18解方程组:I.x+2y-z=62x+y+z=93x+4y+z=18II.x-y=3

解方程组:I.x+2y-z=6 2x+y+z=9 3x+4y+z=18 II.x-y=3 x²-y²=18
解方程组:I.x+2y-z=6 2x+y+z=9 3x+4y+z=18 II.x-y=3 x²-y²=18

解方程组:I.x+2y-z=6 2x+y+z=9 3x+4y+z=18 II.x-y=3 x²-y²=18
1 x=3,y=2,前面两式相加得x+y=5,后面两式相减得,x+3y=9,.
2,分解后面方程式得x+y=6,算出x=9/2,Y=3/2

I . X=3 Y=2 Z=1 II. X=4.5 Y=1.5

(1)x=3,y=2,z=1;
(2)x=9/2,y=3/2