#KhanhHuyen2006 - Xin câu trả lời hay nhất
`A = 2^{60}/(2^{30} . 4)`
`-> A = 2^{60}/(2^{30} . 2^2)`
`-> A = 2^{60}/2^{32}`
`-> A = 2^{28}`
`B = 1/2 + 1/2^2 + 1/2^3 + ... + 1/2^{100}`
`-> 2B = 1 + 1/2 + 1/2^2 +....+ 1/2^{99}`
`-> 2B - B = (1 + 1/2 + 1/2^2 +....+ 1/2^{99}) - (1/2 + 1/2^2 + 1/2^3 + ... + 1/2^{100})`
`-> B = 1 - 1/2^{100}`
`-> B = 1`
`C = 34 . (-20) + (-34) . 60 + 34 . 5`
`-> C = 34 . (-20) + 34 . (-60) + 34 . 5`
`-> C = 34 . [-20 + (-60) + 5]`
`-> C = 34 . (-75)`
`-> C = -2550`
