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5 la puterea 100-4*5 la puterea 99-4*5 la puterea 98-….-4*5
Dau coroana va rog repede!!!!


5 La Puterea 10045 La Puterea 9945 La Puterea 9845 Dau Coroana Va Rog Repede class=

Răspuns :

5¹⁰⁰-4(5⁹⁹+5⁹⁸+...+5)=5

[tex]{5}^{100} -4 \times ( 5\times \frac{5 {}^{99} - 1} {4})[/tex]

=

[tex] {5}^{100} -4 \times ( \frac{ {5}^{100} - 5 }{4} )[/tex]

=

[tex] {5}^{100} - {5}^{100} + 5 = 5[/tex]

5¹⁰⁰-4*5⁹⁹-4*5⁹⁸-….-4*5

5¹⁰⁰-4(5⁹⁹+5⁹⁸+...+5)=E

S=5+5²+...+5⁹⁸+5⁹⁹

5S=-5+(5+5²+5³+...+5⁹⁹+5¹⁰⁰)

5S=-5+S+5¹⁰⁰

4S=5¹⁰⁰-5

S=(1/4)5¹⁰⁰-5/4

E=5¹⁰⁰-4[(1/4)5¹⁰⁰-5/4]=5¹⁰⁰-5¹⁰⁰+5=5