Răspuns :
a/5 - 10 =a/4
a/5 - a/4 = 10
(4a-5a)/20 = 10
-a/20 = 10
-a = 200
a = -200
a/5 - a/4 = 10
(4a-5a)/20 = 10
-a/20 = 10
-a = 200
a = -200
1/5-10=1/4
5/5-50=4/4
4/4+50=5/5
50x4=200
numarul este 200
verificare
1/5=200:5=40
1/4=200:4=50
50-40=10
5/5-50=4/4
4/4+50=5/5
50x4=200
numarul este 200
verificare
1/5=200:5=40
1/4=200:4=50
50-40=10