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我唔識做下面 ge 題目呀,唔該教下啦,我要 step 仲有如果有喱d類型 ge 問題要點做,可唔可以比d exercises 我做呀(唔一定係喱d類型架),thanks 1.A=4π(r2次) Find the value of r for each of the following values of A. (a)36π 2.y=3x+1/1-3x [x]
最佳解答:
1. (a) For A = 36π, A = 4πr^2 ........ r^2 = (r2次) => 36π = 4πr^2 => 36π / (4π) = 4πr^2 / (4π) ........ 兩邊各除 4π => 9 = r^2 => r = 3 .......... r 可以是+/- 3, 但假如 A = 4πr^2 是指圓形面積的公式, i.e. Area = π * radius^2, 則 -3 在這裡不能成立, 因 radius 不可能是負數. 2. 唔係好明寫乜同問乜, 有冇打漏括號...
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- ratio of acid
- what's mean by '' more than words'' ---@1@
- please I want Mozart's family 的資料和圖片!!(15)@1@
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有關數學 ge 問題發問:
我唔識做下面 ge 題目呀,唔該教下啦,我要 step 仲有如果有喱d類型 ge 問題要點做,可唔可以比d exercises 我做呀(唔一定係喱d類型架),thanks 1.A=4π(r2次) Find the value of r for each of the following values of A. (a)36π 2.y=3x+1/1-3x [x]
最佳解答:
1. (a) For A = 36π, A = 4πr^2 ........ r^2 = (r2次) => 36π = 4πr^2 => 36π / (4π) = 4πr^2 / (4π) ........ 兩邊各除 4π => 9 = r^2 => r = 3 .......... r 可以是+/- 3, 但假如 A = 4πr^2 是指圓形面積的公式, i.e. Area = π * radius^2, 則 -3 在這裡不能成立, 因 radius 不可能是負數. 2. 唔係好明寫乜同問乜, 有冇打漏括號...
其他解答:
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