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calculati (y+x)+(t+z),stiind ca x+t=3/22 si y+z=7/33 cum rezolv?

Răspuns :

x+t=3/22    
y+z=7/33
(y+x)+(t+z)=
x+t+y+z=3/22+7/33=(3*3+7*2)/66=(9+14)/66=23/66