Images 4Х 1

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4х 1. Х1+х2-6х3-4х4=6. Х4+4х3-2х2-4х-3=0. (Х3 + 2х2 ) -( х+1)-(х2-х)+(4-х3)=х2+3. (2х2+5х-3)-2(х2+х+4)=0.
Х1+х2-6х3-4х4=6. Х4+4х3-2х2-4х-3=0. (Х3 + 2х2 ) -( х+1)-(х2-х)+(4-х3)=х2+3. (2х2+5х-3)-2(х2+х+4)=0.

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