帮我解这些方程啊.一个过程就行.1.4x+y-z=12 3x+2y+z=-5 x-y+5z=12.2a+7b=3 3a-c=1 -b+3c=43.x:y=3:2 y:Z=5:4 x+y+z=664.a-d=-4 d-2y=-1 a+s-d=-15.a=6s a-4=10s-20d a+12=3y+18d6.a+s=8 a+d=6 s+d=107.3(a+s-d)=15(d-a) 5(a+s-d)=400 15+53/6(a+s)=10000
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![帮我解这些方程啊.一个过程就行.1.4x+y-z=12 3x+2y+z=-5 x-y+5z=12.2a+7b=3 3a-c=1 -b+3c=43.x:y=3:2 y:Z=5:4 x+y+z=664.a-d=-4 d-2y=-1 a+s-d=-15.a=6s a-4=10s-20d a+12=3y+18d6.a+s=8 a+d=6 s+d=107.3(a+s-d)=15(d-a) 5(a+s-d)=400 15+53/6(a+s)=10000](/uploads/image/z/6851577-57-7.jpg?t=%E5%B8%AE%E6%88%91%E8%A7%A3%E8%BF%99%E4%BA%9B%E6%96%B9%E7%A8%8B%E5%95%8A.%E4%B8%80%E4%B8%AA%E8%BF%87%E7%A8%8B%E5%B0%B1%E8%A1%8C.1.4x%2By-z%3D12+3x%2B2y%2Bz%3D-5+x-y%2B5z%3D12.2a%2B7b%3D3+3a-c%3D1+-b%2B3c%3D43.x%3Ay%3D3%3A2+y%3AZ%3D5%3A4+x%2By%2Bz%3D664.a-d%3D-4+d-2y%3D-1+a%2Bs-d%3D-15.a%3D6s+a-4%3D10s-20d+a%2B12%3D3y%2B18d6.a%2Bs%3D8+a%2Bd%3D6+s%2Bd%3D107.3%28a%2Bs-d%29%3D15%28d-a%29+5%28a%2Bs-d%29%3D400+15%2B53%2F6%28a%2Bs%29%3D10000)
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