a) (7/5+3/5)²-(7/5)²-(3/5)²=(7+3/5)²-7×7/5×5-3×3/5×5=
=(10/5)²-49/25-9/25=10×10/5×5-49/25-9/25=
100/25-49/25-9/25=100-49-9 totul pe 25
=158/25
b)(1,7) la 0-5,3=(17/10)la 0 -53/10= 1-53/10 =10-53/10=-43/10(pt ca orice nr diferit de 0 ridicat la putere este 1)
c)(3/6)³-(3/6)²-(3/6)¹=(3×3×3/6×6×6)-(3×3/6×6)-3/6=27/216-9/36-3/6
=27-6×9-3×36 totul supra 216
= 27-54-108 totul supra 216
=-135/216
d)7 la putere 2×3 / 7²=7⁶/7²=7⁶:7²=7 la puterea 6-2= 7⁴=2401
e)2/13-2/13(2²+3²)=0 (pt ca primele 2 fractii iti dau 0, si orice nr sau produs de numere inmultite cu 0 dau ,in final,tot 0 )
f)(8/10+21/10:(1-1/5-1/10)×5)):158/10-2=(8/10+21(:10-2-1)×5)):158/10-2=
=8/10+21/10:13/10×5):158/10-2=(8/10+21/10:65/10):158/10-2=
=(8/10+21/65):158/10-2=(520+210 totul pe 650):158/10-2=
=730/650:158/10-2=730/650×10/158-2=365/65×1/79-2=365/5135-2=73/1027-2=73-2054 totul pe 1027= - 1981/1027
Succes!!!!
