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標題:
99 mc ce maths Q.23 Q44
發問:
99 mc ce maths Q.23 Q44 解釋比我聽
最佳解答:
23.A 鋼球的體積 = 4/3(π)(2)3 = 32π/3 cm3 圓柱容器的底面積 = π(6/2)2 = 9π cm2 水位上升的高度 = (32π/3)/9π = 32/27 cm 44.E 設a為首項 a+ar = 3 a(1+r) = 3 a = 3/(1+r) Sα = a/(1﹣r) = 4 a = 4(1﹣r) ∴3/(1+r) = 4﹣4r 3 = (1+r)(4﹣4r) 3 = 4﹣4r+4r﹣4r2 4r2 = 1 r2 = 1/4 r = -1/2 或 1/2
其他解答:
99 mc ce maths Q.23 Q44
發問:
99 mc ce maths Q.23 Q44 解釋比我聽
最佳解答:
23.A 鋼球的體積 = 4/3(π)(2)3 = 32π/3 cm3 圓柱容器的底面積 = π(6/2)2 = 9π cm2 水位上升的高度 = (32π/3)/9π = 32/27 cm 44.E 設a為首項 a+ar = 3 a(1+r) = 3 a = 3/(1+r) Sα = a/(1﹣r) = 4 a = 4(1﹣r) ∴3/(1+r) = 4﹣4r 3 = (1+r)(4﹣4r) 3 = 4﹣4r+4r﹣4r2 4r2 = 1 r2 = 1/4 r = -1/2 或 1/2
其他解答:
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