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受欢迎的代数 >

0=40x+75-3x^2

解答

0 = 40 x + 75 - 3 x^{2}

解答

x = - \frac{5}{3}, x = 15

+1

十进制

x = - 1.66666 \dots, x = 15

求解步骤

0 = 40 x + 75 - 3 x^{2}

交换两边

40 x + 75 - 3 x^{2} = 0

改写成标准形式

a x^{2} + b x + c = 0

- 3 x^{2} + 40 x + 75 = 0

使用求根公式求解

x_{1, 2} = \frac{- 40 \pm 4 0 ^{2} - 4 ( - 3 ) \cdot 75}{2 ( - 3 )}

4 0^{2} - 4 (- 3) \cdot 75 = 50

x_{1, 2} = \frac{- 40 \pm 50}{2 ( - 3 )}

将解分隔开

x_{1} = \frac{- 40 + 50}{2 ( - 3 )}, x_{2} = \frac{- 40 - 50}{2 ( - 3 )}

x = \frac{- 40 + 50}{2 ( - 3 )} : - \frac{5}{3}

x = \frac{- 40 - 50}{2 ( - 3 )} : 15

二次方程组的解是:

x = - \frac{5}{3}, x = 15

作图

流行的例子

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\frac{4}{3} x + 8 \geq 3 (1 - \frac{1}{3 x})

化简 g^{4/7}*g^{3/7}

s im pl i f y g^{\frac{4}{7}} \cdot g^{\frac{3}{7}}

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2 x^{2} - 11 x - 2 = 0

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