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determinati pe x din:
a) 80-(30+10-x)=60
va rog ajutatima si la b,c,d,e,f,


Răspuns :

80-(30+10-x)=60
80-(40-x)=60
x=60+40-80
x=20
a) 80-(30+10-x)=60
80-40+x=60
x=60-40
x=20