解方程组: x-4 3 = y+1 4 = z+2 5 x-2y+3z=30
解方程组:x-43=y+14=z+25x-2y+3z=30....
解方程组: x-4 3 = y+1 4 = z+2 5 x-2y+3z=30 .
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明靖滢Qm
2014-11-13
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, 由①可设 = = =k, x=3k+4,y=4k-1,z=5k-2, 代入方程②得,3k+4-2(4k-1)+3(5k-2)=30, 去括号得,3k+4-8k+2+15k-6=30, 解得k=3, 所以x=3×3+4=13, y=4×3-1=11, z=5×3-2=13, 因此,这个方程组的解是 . |
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