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方程式既數學題唔識做

發問:

1、 2份之s+7 減8份之3s=11 咁s係咩 2、 3t- 12份之t-6 等於18 咁t係咩 3、ABCD係一個正方形 AB係3x+3 BC係5x-11 咁正方形面積係??

最佳解答:

1) (s+7)/2-3s/8=11 4(s+7)-3s=11 4s+28-3s=11 s+28=11 s=-13 2) (t-6)/(3t-12)=18 t-6=18(3t-12)=54t-216 -6+216=54t-t 210=53t t=210/53 3)Because AB=BC(the properties of square) 3x+3=5x-11 3+11=5x-3x 14=2x x=7 AB=3x7+3=24 So, 正方形area=24x24=576 2008-07-24 15:00:59 補充: 其實我都唔知第二題有冇誤解~~~ 3t-(t-6)/12=18 36t-t+6=216 35t=210 t=6 2008-07-24 15:03:03 補充: sry, (1) mistakes 1) (s+7)/2-3s/8=11 4(s+7)-3s=11 4s+28-3s=11 s+28=11 s=-17 2008-07-24 16:00:43 補充: sry, (1) mistakes 1) (s+7)/2-3s/8=11 4(s+7)-3s=88 4s+28-3s=88 s+28=88 s=60

其他解答:

1.) s+7/2 - 3s/8= 11 2(s+7/2)-2(3s/8)=2(11) s+7 - 3s/4 =22 4(s+7)- 4(3s/4) =4(22) 4s+28-3s =88 s+28 =88 s=88-28 s= 60 2.) 3t- t-6/12 =18 12(3t) -12(t-6/12) =12(18) 36t - (t-6) =216 36t - t+6 =216 36t -t =216-6 35t=210 t= 6 3.) 3x +3 =5x-11 3x-5x = -11 -3 -2x =-14 x=7 area of square = [3(7)+3] ^2 = 24^2 = 576|||||1. (s+7)/2 - 3s/8 = 11 [4(s+7) - 3s] / 8 = 11 4s+28-3s = 88 s = 88-28 s = 60 2. (t-6) / (3t-12) = 18 (t-6) / 3(t-4) = 18 (t-6) / (t-4) = 6 t-6 = 6(t-4) t-6 = 6t-24 5t = 18 t = 3.6 3. 因為ABCD係一個正方形,即是AB=BC=CD=DA。 所以,將AB=3x+3與BC的5x-11寫成 AB = BC 3x+3 = 5x-11 5x-3x = 11+3 2x = 14 x = 7 2008-07-24 15:26:49 補充: 將 x 分別代入AB及BC,然後計算面積。 面積 = (AB)(BC) 面積 = [3(7)+3] [5(7)-11] 面積 = (24) (24) = 576 2008-07-24 15:37:58 補充: 第二題看錯題目,重新計過。 3t - (t-6)/12 = 18 3t(12) - (t-6) = 18(12) 36t-t+6 = 216 35t = 210 t = 6|||||1. s/2+7-3s/8=11 4s+56-3s=88 s=32// 2008-07-24 14:58:29 補充: 2.3t-(t-6)/12=18 36t-t+6=216 t=6// 2008-07-24 14:59:19 補充: 3x+3 =5x-11 14=2x x=7 then Area of sq = 7^2=49// 2008-07-24 14:59:52 補充: AB=3x7+3=24 So, 正方形area=24x24=576

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