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受欢迎的代数 >

81y^2-k=((9y+2)/3)((9y-2)/3)

解答

81 y^{2} - k = (\frac{9 y + 2}{3}) (\frac{9 y - 2}{3})

解答

y = \frac{- 4 + 9 k}{18 2}, y = - \frac{- 4 + 9 k}{18 2}

求解步骤

81 y^{2} - k = (\frac{9 y + 2}{3}) (\frac{9 y - 2}{3})

展开

(\frac{9 y + 2}{3}) (\frac{9 y - 2}{3}) : 9 y^{2} - \frac{4}{9}

81 y^{2} - k = 9 y^{2} - \frac{4}{9}

将

k

到右边

81 y^{2} = 9 y^{2} - \frac{4}{9} + k

将

9 y^{2}

para o lado esquerdo

72 y^{2} = - \frac{4}{9} + k

两边除以

72

y^{2} = \frac{- 4 + 9 k}{648}

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

y = \frac{- 4 + 9 k}{648}, y = - \frac{- 4 + 9 k}{648}

化简

\frac{- 4 + 9 k}{648} : \frac{- 4 + 9 k}{18 2}

化简

- \frac{- 4 + 9 k}{648} : - \frac{- 4 + 9 k}{18 2}

y = \frac{- 4 + 9 k}{18 2}, y = - \frac{- 4 + 9 k}{18 2}

作图

流行的例子

5 t^{2} - 20 t - 25 = 0

solvefor x,f(x+h)-f=3x-4x^2

so l v e f or x, f (x + h) - f = 3 x - 4 x^{2}

(x^2)/3-x-9/6 = 3/2

\frac{x ^{2}}{3} - x - \frac{9}{6} = \frac{3}{2}

solvefor x,3x^2-6xy-4xy-8y^2=0

so l v e f or x, 3 x^{2} - 6 x y - 4 x y - 8 y^{2} = 0

solvefor x,(x-1)^2+(y+2)^4=0

so l v e f or x, (x - 1)^{2} + (y + 2)^{4} = 0