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受欢迎的代数 >

2pir=pir^2

解答

2 π r = π r^{2}

解答

r = 0, r = 2

求解步骤

2 π r = π r^{2}

将

π r^{2}

para o lado esquerdo

2 π r - π r^{2} = 0

因式分解

2 π r - π r^{2} : - π r (r - 2)

- π r (r - 2) = 0

使用零因数法则： If

ab = 0

then

a = 0

or

b = 0

r = 0 or r - 2 = 0

解

r - 2 = 0 : r = 2

二次方程组的解是:

r = 0, r = 2

作图

流行的例子

1 8^{2} + 1 8^{2} = x^{2}

solvefor y,2x^3-4x-4y^2=0

so l v e f or y, 2 x^{3} - 4 x - 4 y^{2} = 0

x^{2} + 5 x + 1 = \frac{3}{2}

solvefor x,9x^2-12x+4=0

so l v e f or x, 9 x^{2} - 12 x + 4 = 0

solvefor r^2=(y-2)^2+(x/2)^2,y

so l v e f or r^{2} = (y - 2)^{2} + (\frac{x}{2})^{2}, y