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1.Calculați |2^{30} - 3^20| + |2^30 - 3^20| -2 x 3^20.

Răspuns :

[tex]2^{30}=(2^3)^{10}=8^{10}\\ 3^{20}=(3^2})^{10}=9^{10}=>\\ 2^{30}<3^{20}\\ |2^{20}-3^{20}|+|2^{20}+3^{20}|-2\cdot3^{20}=\\ =-(2^{20}-3^{20})+(2^{20}+3^{20})-2\cdot3^{20}=\\ =3^{20}-2^{20}+2^{20}+3^{20}-2\cdot3^{20}=\\ =3^{20}+3^{20}-2\cdot3^{20}=\\ =2\cdot 3^{20}-2\cdot3^{20}=\\ =0[/tex]