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Aflati nr "x" stiind ca:
X+Y=18
X+U=15
X+Z=25
X+T=30
Y+Z+T+U=48

Urgent,va rog!!!


Răspuns :

X+Y+X+U+X+Z+X+T=18+15+25+30 4X+(Y+U+Z+T)=88 4X+48=88 4X=88-48 4X=40 X=40:4 X=10
X+Y=18
X+U=15
X+Z=25
X+T=30
adunam toate aceste ecuatii=>
---------------
X+Y+X+U+X+Z+X+T=18+15+25+30
 4X+(Y+U+Z+T)=88
 4X+48=88
 4X=88-48
4X=40
X=40:4
 X=10