Toán Lớp 6: 3) Cho
A=1+2 mũ 2 + 2 mũ 3 + …. + 2 mũ 2001
B= 2 mũ 2022 -1
So sánh A và B
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Toán Lớp 6: 3) Cho
A=1+2 mũ 2 + 2 mũ 3 + …. + 2 mũ 2001
B= 2 mũ 2022 -1
So sánh A và B
Comments ( 2 )
2A=2+2^2+2^3+2^4+………..+2^2002
2A-A=(2+2^2+2^3+2^4+………..+2^2002)-(1+2+2^2+2^3+……….+2^2001)
A=2^2002-1
Mà B=2^2002-1
=>A=B