用消元法解下列各题5x-y=9, 2x-3=0, 3x+2y=5, 2x+3y=-1,y=-3x+1 5x-7y=1 y=2x-1 6x-5y=11 2x-5y=-3, 3x+2y=3,3x+10y=13 6x-5y=6急急
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![用消元法解下列各题5x-y=9, 2x-3=0, 3x+2y=5, 2x+3y=-1,y=-3x+1 5x-7y=1 y=2x-1 6x-5y=11 2x-5y=-3, 3x+2y=3,3x+10y=13 6x-5y=6急急](/uploads/image/z/10394433-9-3.jpg?t=%E7%94%A8%E6%B6%88%E5%85%83%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E5%90%84%E9%A2%985x-y%3D9%2C+++++++++++2x-3%3D0%2C+++++++++++++3x%2B2y%3D5%2C++++++++++++++2x%2B3y%3D-1%2Cy%3D-3x%2B1++++++++++++5x-7y%3D1++++++++++++++++y%3D2x-1+++++++++++++++++++6x-5y%3D11+++++++2x-5y%3D-3%2C++++++++++++++++3x%2B2y%3D3%2C3x%2B10y%3D13++++++++++++++++6x-5y%3D6%E6%80%A5%E6%80%A5)
用消元法解下列各题5x-y=9, 2x-3=0, 3x+2y=5, 2x+3y=-1,y=-3x+1 5x-7y=1 y=2x-1 6x-5y=11 2x-5y=-3, 3x+2y=3,3x+10y=13 6x-5y=6急急
用消元法解下列各题
5x-y=9, 2x-3=0, 3x+2y=5, 2x+3y=-1,
y=-3x+1 5x-7y=1 y=2x-1 6x-5y=11
2x-5y=-3, 3x+2y=3,
3x+10y=13 6x-5y=6
急急急急急急急急急急急急急急,写的快的再加分,要过程
用消元法解下列各题5x-y=9, 2x-3=0, 3x+2y=5, 2x+3y=-1,y=-3x+1 5x-7y=1 y=2x-1 6x-5y=11 2x-5y=-3, 3x+2y=3,3x+10y=13 6x-5y=6急急
要消元也得是方程组啊,把题补充完整再说吧.
1、两等式左右直接相加,消去y,可解
2.等式1两边同时乘以5减去等式2两边同时乘以2,消去x,可解
3、等式1减去等式2两边同时乘以2,消去y
4、等式1两边同时乘以3,减去等式2,消去x
5、等式1两边同时乘以2,加上等式2,消去y
6、等式1两边同时乘以2,减去等式2,消去x...
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1、两等式左右直接相加,消去y,可解
2.等式1两边同时乘以5减去等式2两边同时乘以2,消去x,可解
3、等式1减去等式2两边同时乘以2,消去y
4、等式1两边同时乘以3,减去等式2,消去x
5、等式1两边同时乘以2,加上等式2,消去y
6、等式1两边同时乘以2,减去等式2,消去x
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统称上排的为①式,下排的为②式
(1) ①+②消y 8x=10 x=5/4
(2)是2x-3y=0不 5①-2②消x y=2 x=3
(3) ①-2②消y x=1 y=1
(4) 3①-②消x y=-1 x=1
(5) 2①+②消y x=1 y=1
(6)2①-②消x y=0 x=1
-y=9-5y y=-9-5y .... ...
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-y=9-5y y=-9-5y .... 2x=0+3 x=3/2
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