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式子1.3x+2y-z=3 式子2.x-y-z=-4 式子3.x+y+z=8 式子2+式子3得:2x=4,所以x=2 式子1-式子2得:2x+3y=7,所以y=1 x=2,y=1,帶入任意式子中,z=5.
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