Toán Lớp 6: 2+2^2+2^3+…+2^20 các bạn giúp mik nha!
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Toán Lớp 6: 2+2^2+2^3+…+2^20 các bạn giúp mik nha!
Comments ( 2 )
A=2+2^2+2^3+………….+2^20
2A=2^2+2^3+2^4+…………..+2^21
2A-A=(2^2+2^3+2^4+…………..+2^21)-(2+2^2+2^3+………….+2^20)
A=2^21-2
A=2097152-2
A=2097150