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中4 maths 2條
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最佳解答:
13)4n(n+1) = 8(4 + n + n+1)n2 + n = 2(5 + 2n)n2 - 3n - 10 = 0(n - 5)(n + 2) = 0n = 5 或 n = - 2(捨)n 和 n+1 是 5 和 6 , (B) 14)x + (14 - x) + √[x2 + (14 - x)2] = 24√[x2 + (14 - x)2] = 10x2 + (14 - x)2 = 100x2 + x2 - 28x + 196 = 1002x2 - 28x + 96 = 0x2 - 14x + 48 = 014x - x2 = 48x(14 - x) = 48(1/2)(x)(14 - x) = 24△面積 = 24cm2 , (C)
其他解答:E2A5F59BAA12C031
中4 maths 2條
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http://img842.imageshack.us/img842/221/20110115004023.jpg最佳解答:
13)4n(n+1) = 8(4 + n + n+1)n2 + n = 2(5 + 2n)n2 - 3n - 10 = 0(n - 5)(n + 2) = 0n = 5 或 n = - 2(捨)n 和 n+1 是 5 和 6 , (B) 14)x + (14 - x) + √[x2 + (14 - x)2] = 24√[x2 + (14 - x)2] = 10x2 + (14 - x)2 = 100x2 + x2 - 28x + 196 = 1002x2 - 28x + 96 = 0x2 - 14x + 48 = 014x - x2 = 48x(14 - x) = 48(1/2)(x)(14 - x) = 24△面積 = 24cm2 , (C)
其他解答:E2A5F59BAA12C031
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