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受欢迎的代数 >

-4r^2+16r=0

解答

- 4 r^{2} + 16 r = 0

解答

r = 0, r = 4

求解步骤

- 4 r^{2} + 16 r = 0

使用求根公式求解

r_{1, 2} = \frac{- 16 \pm 1 6 ^{2} - 4 ( - 4 ) \cdot 0}{2 ( - 4 )}

1 6^{2} - 4 (- 4) \cdot 0 = 16

r_{1, 2} = \frac{- 16 \pm 16}{2 ( - 4 )}

将解分隔开

r_{1} = \frac{- 16 + 16}{2 ( - 4 )}, r_{2} = \frac{- 16 - 16}{2 ( - 4 )}

r = \frac{- 16 + 16}{2 ( - 4 )} : 0

r = \frac{- 16 - 16}{2 ( - 4 )} : 4

二次方程组的解是:

r = 0, r = 4

作图

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s im pl i f y e^{i \cdot π}

49 - x^{2} \geq 0

x*20000*(2153/315000)^2=29800

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