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-3,5+ radical din 400 -7 intreg si 2 pe 5+?=2015

Răspuns :

-3,5+√400-7 2/5+ x =2015
-35/10+20- 37/5+x=2015
-35/10+20- 37/5+x=2015
-35+200-74+10x=20150
10x=20150-91
10x=20059
x=2005,9