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For rectangle , perimeter = 2 × (length + width) 140t + 10 = 2 × (40t + width) 70t + 5 = 40t + width width = 30t + 5 10 ≤ t ≤ 12 30 × 10 + 5 ≤ width ≤ 30 × 12 + 5 305 ≤ width ≤ 365 (B) and (C) are possible.
circle(圓) rectangle (長方形) square(正方形) triangle(三角形) star(星形) oval(橢圓) pentagon(五邊形) trapezoid...
... so x≦6 2013-07-24 18:01:37 補充： 6-1 Area of rectangle less than 35 definition of area of rectangle is length multiply by width ...
... then ∫Df(x)dx=0 Proof of claim: Choose a compact rectangle A⊃D Define g(x)=f(x) if x∈D g(x)=0 if...
... such that their measures converge to zero. The open rectangle Cov(n) is boubded by thefollowing four lines :y-x=1/n, y-x=-1...
設長方形的長為 2ｘ，寬為 ｙ，則面積 Ａ ＝ 2ｘｙ，且 ｒ² ＝ ｘ² ＋ｙ²（半徑 ｒ＝10）所以Ａ（ｘ）＝ 2ｘ（ｒ²－ｘ²）1/2 ＝ 2ｘ（10²－ｘ²）1/2 當...
...and the width is 36m 3) Let the width be x m The length of a rectangle is 7 m less than twice the width => the length=2x-7 When the length...
2(x+y)=20.....(1) (x+2)(y+2)=2xy.....(2) from (1), x+y=10 y=10-x.....(3) substitute (3) into (2) (x+2)(10-x+2)=2x(10-x) -x^2+10x+24=20x-2x^2 x^2-10x+24=0 (x-6)(x-4)=0 x=6 or x=4 x=6, y=4 or x=4, y=6
