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受欢迎的代数 >

2=0.013x^2-1.18x+28.24

解答

2 = 0.013 x^{2} - 1.18 x + 28.24

解答

x = \frac{2 ( 295 + 1745 )}{13}, x = \frac{2 ( 295 - 1745 )}{13}

+1

十进制

x = 51.81126 \dots, x = 38.95796 \dots

求解步骤

2 = 0.013 x^{2} - 1.18 x + 28.24

在两边乘以

1000

2000 = 13 x^{2} - 1180 x + 28240

交换两边

13 x^{2} - 1180 x + 28240 = 2000

将

2000

para o lado esquerdo

13 x^{2} - 1180 x + 26240 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 1180 ) \pm ( - 1180 ) ^{2} - 4 \cdot 13 \cdot 26240}{2 \cdot 13}

(- 1180)^{2} - 4 \cdot 13 \cdot 26240 = 41745

x_{1, 2} = \frac{- ( - 1180 ) \pm 4 1745}{2 \cdot 13}

将解分隔开

x_{1} = \frac{- ( - 1180 ) + 4 1745}{2 \cdot 13}, x_{2} = \frac{- ( - 1180 ) - 4 1745}{2 \cdot 13}

x = \frac{- ( - 1180 ) + 4 1745}{2 \cdot 13} : \frac{2 ( 295 + 1745 )}{13}

x = \frac{- ( - 1180 ) - 4 1745}{2 \cdot 13} : \frac{2 ( 295 - 1745 )}{13}

二次方程组的解是:

x = \frac{2 ( 295 + 1745 )}{13}, x = \frac{2 ( 295 - 1745 )}{13}

作图

流行的例子

(x - 6.25)^{2} = 3

4y^2-215y+2875=0

4 y^{2} - 215 y + 2875 = 0

solvefor x,a=x^2m+x^2n+x^2q

so l v e f or x, a = x^{2} m + x^{2} n + x^{2} q

16 x^{2} - 625 = 0

solvefor k,k^2=n^2+3n+15

so l v e f or k, k^{2} = n^{2} + 3 n + 15