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Afla numarul necunoscut din egalitatea:
(25*a+250)/(35/7) - 25=75



Răspuns :

(25*a+250)/(35/7) - 25=75
(25a+250):(35:7)-25=75 ;am pus in loc de supra impartit pt. ca orce fractie ,ex 35/7 supra inseamna impartit deci:
25*a+250:5-25=75
25*a+50-25=75
25*a+50=75+25
25*a+50= 100
25*a=100-50
25*a+50
a=50:25
a=2
(25*a+250)/(37/5)=75+25
25*a+250
=100*35/7
25*a+250
=500
25*a
=500-250
a
=250/25
a
=10