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受欢迎的代数 >

128.8=0.006y^2-0.03y+119

解答

128.8 = 0.006 y^{2} - 0.03 y + 119

解答

y = \frac{5 ( 3 + 2361 )}{6}, y = \frac{5 ( 3 - 2361 )}{6}

+1

十进制

y = 42.99176 \dots, y = - 37.99176 \dots

求解步骤

128.8 = 0.006 y^{2} - 0.03 y + 119

在两边乘以

1000

128800 = 6 y^{2} - 30 y + 119000

交换两边

6 y^{2} - 30 y + 119000 = 128800

将

128800

para o lado esquerdo

6 y^{2} - 30 y - 9800 = 0

使用求根公式求解

y_{1, 2} = \frac{- ( - 30 ) \pm ( - 30 ) ^{2} - 4 \cdot 6 ( - 9800 )}{2 \cdot 6}

(- 30)^{2} - 4 \cdot 6 (- 9800) = 102361

y_{1, 2} = \frac{- ( - 30 ) \pm 10 2361}{2 \cdot 6}

将解分隔开

y_{1} = \frac{- ( - 30 ) + 10 2361}{2 \cdot 6}, y_{2} = \frac{- ( - 30 ) - 10 2361}{2 \cdot 6}

y = \frac{- ( - 30 ) + 10 2361}{2 \cdot 6} : \frac{5 ( 3 + 2361 )}{6}

y = \frac{- ( - 30 ) - 10 2361}{2 \cdot 6} : \frac{5 ( 3 - 2361 )}{6}

二次方程组的解是:

y = \frac{5 ( 3 + 2361 )}{6}, y = \frac{5 ( 3 - 2361 )}{6}

作图

流行的例子

-2x^2=(5-x)((2x-2)/5)

- 2 x^{2} = (5 - x) (\frac{2 x - 2}{5})

- 0.62 x^{2} + 2.8 = 0

u^{2} + n + 1 = 0

solvefor x,x^2+y^2-2y=-1

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

6 n^{2} - 11 n - 726 = 0