解方程组:2X-5y+11=0-----------------(1)7y+4z=0----------------------(2)5x-2z=0-----------------------(3)(3)*2得:10x-4z=0----------(4)(4)+(2)得:10x+7y=0-------(5)(1)*5得:10x-25y=-55------(6)(5)-(6)...
解方程组2X-5y+11=0;7y+4z=0;5x_2z=0
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