Toán Lớp 6: B= 1+5^2+5^3+…+5^150
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Toán Lớp 6: B= 1+5^2+5^3+…+5^150
Giúp e với ạ e cần gấp
Comments ( 2 )
5B=5+5^2+5^3+5^4+…….+5^151
5B-B=(5+5^2+5^3+5^4+…….+5^151)-(1+5+5^2+5^3+…+5^150)
4B=5^151-1
B=(5^151-1)/4