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Y=?
3+3×{3+3×[3+3 ×(3-3:y )]}=3×31


Răspuns :

3*{3+3*[3+3*(3-3/y)]}=90
3+3*[3+3*(3-3/y)]=30
3*[3+3*(3-3/y)]=27
3+3*(3-3/y)=9
3*(3-3/y)=6
3-3/y=2
3/y=1
y=3


3*{3+3*[3+3*(3-3/y)]}=90
3+3*[3+3*(3-3/y)]=30
3*[3+3*(3-3/y)]=27
3+3*(3-3/y)=9
3*(3-3/y)=6
3-3/y=2
3/y=1
y=