數學題(5分)－aptzmcv的部落格

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數學題(5分)

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Make (t) the subject of the formula rt - 1 = 1 - 2t ￣r￣￣s￣更新: 1) Make (t) the subject of the formula (rt - 1)/r = 1 - (2t)/s 發生錯誤,sor

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rt-1=1-2t rt+2t=2 t(r+2)=2 t=2/(r+2) 2007-01-03 21:00:31 補充： 1) Make (t) the subject of the formula (rt - 1)/r = 1 - (2t)/s (rt - 1)/r = (s-2t)/s(rt - 1)s = (s-2t)rrst-s = rs - 2rtrst 2rt = rs st(rs 2r) = rs st = (rs s) / (rs 2r)答案可以係(rs s)/(rs 2r) 或者 s(r 1)/r(s 2), 有factorize和冇factorize係冇分別 2007-01-03 21:04:38 補充： sor~ 應該係(rt - 1)/r = 1 - (2t)/s (rt - 1)/r = (s-2t)/s(rt - 1)s = (s-2t)rrst-s = rs - 2rtrst 2rt = rs st(rs 2r) = rs st = (rs s) / (rs 2r)為了省時, 我本人認為t = (rs s) / (rs 2r) 好D, 因為考試為左呢少少野而唔夠時間就係好唔抵的, 個老師又唔會因為咁而比多D分你的(以上是我的意見) 2007-01-03 21:06:54 補充： 1) Make (t) the subject of the formula (rt - 1)/r = 1 - (2t)/s (rt - 1)/r = (s-2t)/s(rt - 1)s = (s-2t)rrst-s = rs - 2rtrst+2rt = rs+st(rs+2r) = rs+st = (rs+s) / (rs+2r)sorry, 我唔知點解次次遞交都冇晒D符號, 好對唔住

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