(1)5X+2Y=16,Y=1;(2)Y=3/4X,X-8Y=-15;(3)3分之2X+5Y=6分之X-2Y=2;(4)2X+3Y-Z=11,2X+Y-5Z=8,-2X+7Y+Z=19;要过程,
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![(1)5X+2Y=16,Y=1;(2)Y=3/4X,X-8Y=-15;(3)3分之2X+5Y=6分之X-2Y=2;(4)2X+3Y-Z=11,2X+Y-5Z=8,-2X+7Y+Z=19;要过程,](/uploads/image/z/334509-69-9.jpg?t=%EF%BC%881%EF%BC%895X%2B2Y%3D16%2CY%3D1%3B%282%29Y%3D3%2F4X%2CX-8Y%3D-15%3B%283%293%E5%88%86%E4%B9%8B2X%2B5Y%3D6%E5%88%86%E4%B9%8BX-2Y%3D2%3B%284%292X%2B3Y-Z%3D11%2C2X%2BY-5Z%3D8%2C-2X%2B7Y%2BZ%3D19%3B%E8%A6%81%E8%BF%87%E7%A8%8B%2C)
(1)5X+2Y=16,Y=1;(2)Y=3/4X,X-8Y=-15;(3)3分之2X+5Y=6分之X-2Y=2;(4)2X+3Y-Z=11,2X+Y-5Z=8,-2X+7Y+Z=19;要过程,
(1)5X+2Y=16,Y=1;(2)Y=3/4X,X-8Y=-15;(3)3分之2X+5Y=6分之X-2Y=2;(4)2X+3Y-Z=11,2X+Y-5Z
=8,-2X+7Y+Z=19;要过程,
(1)5X+2Y=16,Y=1;(2)Y=3/4X,X-8Y=-15;(3)3分之2X+5Y=6分之X-2Y=2;(4)2X+3Y-Z=11,2X+Y-5Z=8,-2X+7Y+Z=19;要过程,
(1).将Y=1,带入5X+2Y=16,即5X+2=16,5X=14,X=14/5 (2).将Y=3/4X代入X-8Y=-15,即X-3/4X=-15,1/4X=-15,X=-60 (3).2X/3+5Y=2 ①,X/6-2Y=2 ②, ①×2+②×5得,X=84/13,-6/13 (4).2X+3y-z=11 ①,2x+y-5z=8 ②,-2x+7y+z=19 ③, ①+③得,10y=30,即y=3, ①-②得,4z=-3, 即z=-3/4,x=5/8,应该是对的
求采纳.啊
(1).将Y=1,带入5X+2Y=16,即5X+2=16,5X=14,X=14/5
(2).将Y=3/4X代入X-8Y=-15,即X-3/4X=-15,1/4X=-15,X=-60
(3).2X/3+5Y=2 ①,X/6-2Y=2 ②,
①×2+②×5得,X=84/13,-6/13
(4).2X+3y-z=11 ...
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(1).将Y=1,带入5X+2Y=16,即5X+2=16,5X=14,X=14/5
(2).将Y=3/4X代入X-8Y=-15,即X-3/4X=-15,1/4X=-15,X=-60
(3).2X/3+5Y=2 ①,X/6-2Y=2 ②,
①×2+②×5得,X=84/13,-6/13
(4).2X+3y-z=11 ①,2x+y-5z=8 ②,-2x+7y+z=19 ③,
①+③得,10y=30,即y=3,
①-②得,4z=-3,即z=-3/4,x=5/8
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