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2014-11-09T10:07:08+02:00
X+3y-3z=x+2y+y-3z=17+4=21
2x+5y-3z=2x+4y+y-3z=2*17+4=38
3x+6y+2y-6z=3*(x+2y)+2*(y-3z)=3*17+2*4=51+8=59
(2x+4y)x(x+4y-6z)=2*(x+2y)x(x+2y+2y-6z)=2*17x(17+2*4)=34x(17+8)=34*25=850