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efectuati folosind regulile de calcul cu puteri
a)4la12:4la10=
b)9la23x9la7:9la28=
c)(13la3)tot la10:13la29=
d)10la3x10la5:10la7=
e)(2la2)totla13;(2la10)tot la2:2la4=
f)7la2x7la3x7la4x7la5x7la12=