introduc intregii in fractie di fac niste simlificari la ultima inmultire si obtin:
[(6/5)^2- (7/10)^2+(6/5-7/10)^2] * 25/2= Acum efectuez ridicarile la putere
[36/25- 49/100+(12-7 totul supra 10)^2] * 25/2=
[144/100- 49/100+(5/10)^2] * 25/2=
( 95/100+ 25/100) * 25/2=
120/100 * 25/2= 60/4= 15
