有一数列按一定规律排列成1-2,4,-8,16,-32…若设其中一数为x则其后面一数为
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x1 = +1 =(-1)^0 × 2^0
x2 = -2 =(-1)^1 × 2^1 = -2×x1
x3 = +4 =(-1)^2 × 2^2 = -2×x2
x4 = -8 =(-1)^3 × 2^3 = -2×x3
x5 = +16 =(-1)^4 × 2^4 = -2×x4
x6 = -32 =(-1)^5 × 2^5 = -2×x5
看懂规律了吗(解题的关键是:看懂规律并总结出一般性的式子)
所以,答案是:-2x
x2 = -2 =(-1)^1 × 2^1 = -2×x1
x3 = +4 =(-1)^2 × 2^2 = -2×x2
x4 = -8 =(-1)^3 × 2^3 = -2×x3
x5 = +16 =(-1)^4 × 2^4 = -2×x4
x6 = -32 =(-1)^5 × 2^5 = -2×x5
看懂规律了吗(解题的关键是:看懂规律并总结出一般性的式子)
所以,答案是:-2x
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