Toán tính A=1+2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^10 17/08/2021 By Daisy tính A=1+2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^10
Đáp án: A=1+2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^10 2A=2+2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^10+2^11 2A-A=(2+2^2….+2^11)-(1+2+…..+2^10) A=2^11-1 A=2048-1 A=2047 Giải thích các bước giải: Trả lời
A=1+2 +2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^10 ⇔ 2A = 2 + 2^2 + 2^3 + 2^4 + 2^5 + 2^6 + 2^7 + 2^8 + 2^9 + 2^10 + 2^11 ⇔ 2A – A = (2 + 2^2 + … + 2^11) – (1 + 2 + … + 2^10) ⇔ A = 2^11 – 1 ⇔ A = 2048 – 1 ⇔ A = 2047 Trả lời
Đáp án: A=1+2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^10
2A=2+2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^10+2^11
2A-A=(2+2^2….+2^11)-(1+2+…..+2^10)
A=2^11-1
A=2048-1
A=2047
Giải thích các bước giải:
A=1+2 +2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^10
⇔ 2A = 2 + 2^2 + 2^3 + 2^4 + 2^5 + 2^6 + 2^7 + 2^8 + 2^9 + 2^10 + 2^11
⇔ 2A – A = (2 + 2^2 + … + 2^11) – (1 + 2 + … + 2^10)
⇔ A = 2^11 – 1
⇔ A = 2048 – 1
⇔ A = 2047