Toán Lớp 6: Tính biểu thức A =4+2^2+2^3+…..+2^2021
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Toán Lớp 6: Tính biểu thức A =4+2^2+2^3+…..+2^2021
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A=2^2+2^2+2^3+……..2^2021
2A=2^3+2^3+2^4+……….+2^2022
2A-A=(2^3+2^3+2^4+……….+2^2022)-(2^2+2^2+2^3+……..2^2021)
A=2^3+2^2022-(2^2+2^2)
A=8+2^2022-8
A=2^2022