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受欢迎的代数 >

-2x^2+4x-7=0

解答

- 2 x^{2} + 4 x - 7 = 0

解答

x = 1 - i \frac{5}{2}, x = 1 + i \frac{5}{2}

求解步骤

- 2 x^{2} + 4 x - 7 = 0

使用求根公式求解

x_{1, 2} = \frac{- 4 \pm 4 ^{2} - 4 ( - 2 ) ( - 7 )}{2 ( - 2 )}

化简

4^{2} - 4 (- 2) (- 7) : 210 i

x_{1, 2} = \frac{- 4 \pm 2 10 i}{2 ( - 2 )}

将解分隔开

x_{1} = \frac{- 4 + 2 10 i}{2 ( - 2 )}, x_{2} = \frac{- 4 - 2 10 i}{2 ( - 2 )}

x = \frac{- 4 + 2 10 i}{2 ( - 2 )} : 1 - i \frac{5}{2}

x = \frac{- 4 - 2 10 i}{2 ( - 2 )} : 1 + i \frac{5}{2}

二次方程组的解是:

x = 1 - i \frac{5}{2}, x = 1 + i \frac{5}{2}

作图

流行的例子

7(2x-3)+4(x+1)=1

7 (2 x - 3) + 4 (x + 1) = 1

(5(3(2)^2-2(2)))/((3(2)-1)^2)

\frac{5 ( 3 ( 2 ) ^{2} - 2 ( 2 ) )}{( 3 ( 2 ) - 1 ) ^{2}}

s im pl i f y i^{91}

化简 ((4^4)^4)^4

s im pl i f y ((4^{4})^{4})^{4}

n + 5 > 21