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2x4y3z 3x2y5z

x=4,y=1 1ʽ x-y=3 2ʽ x+y=5 2ʽ-1ʽ y=1 2ʽ+1ʽ x=4 (2)2x+y=32 2x+y=0 -3/7, 22/7 0, 5 1, 1

⣺zΪ֪̣ɽ ֵʽУ

3x+4y=15 2y-z=2 x+2z=9 y=(2+z)/2 x=9-2z 3(9-2z)+4+2z=15 z=4 y=3 x=1 x+y+z=8 (1) 2x+3y-z=6 (2) 3x-y+z=8 (3) (1)+(2) 3x+4y=14 (1)-(3) -2x+2y=0 x=y x=2 y=2 z=4 2x+y+z=16 (1) 3x+2y+4z=44 (2) x+3y+5z=52 6x+3y+3z=48 x-2z=-12 -5x+2z=4...

23x+2y=0,5z-2y=0,ʽ2x+3y+z/-2x-3y+2zֵΪ? 3.2x-3y+z=10,3x+8y+4z=5,x+y+z=? 4.֪x+y/2=y+z/3=x+z/4=-2,...

⣺ 2x+4y-3Z=9 3x-2y-4z=8 5x-6y-5z=7 ٣کۣ ١3ڡ2; 4yz=5 16yz=11 y=1/2 z=3 x=1

ɻΪ3x+3y4z8x+5z83x+4y5z?1ɢ-ٵãz=1+yٵã3x-y=4y=3x-4ܣɢ+۵ã11x+4y=7ݣѢܴݵãx=1y=-1z=01989x-y+25z=1990ʴΪ1990

ⷽʵѣ޷ǾôԪͼӼԪ ⣺ 5X-4Y+4Z=13 .................. 2X+7Y-3Z=19 .................. 3X+2Y-Z=18 ................... ++۵10X+5Y=50 2X+Y=10........... x4 :12X+8Y-4Z=72............

12\2x=248x-4*12=099-3x=9018-7+6x=535x+...y=60 39.46y+3=95 40.23y+65=88 41.97-z...78y+2y=160 12: 88-x=80 13: 9-4x=1 14:...

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