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受欢迎的代数 >

0=8.2+1/2 (9.8)t^2

解答

0 = 8.2 + \frac{1}{2} (9.8) t^{2}

解答

t = \frac{2.09184 E 15}{1.25 E 15} i, t = - \frac{2.09184 E 15}{1.25 E 15} i

求解步骤

0 = 8.2 + \frac{1}{2} (9.8) t^{2}

展开

8.2 + \frac{1}{2} (9.8) t^{2} : 8.2 + \frac{9.8}{2} t^{2}

0 = 8.2 + \frac{9.8}{2} t^{2}

交换两边

8.2 + \frac{9.8}{2} t^{2} = 0

将

8.2

到右边

\frac{9.8}{2} t^{2} = - 8.2

在两边乘以

2

9.8 t^{2} = - 16.4

两边除以

9.8

t^{2} = - 1.67346 \dots

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

t = - 1.67346 \dots, t = - - 1.67346 \dots

- 1.67346 \dots = \frac{2.09184 E 15}{1.25 E 15} i

- - 1.67346 \dots = - \frac{2.09184 E 15}{1.25 E 15} i

t = \frac{2.09184 E 15}{1.25 E 15} i, t = - \frac{2.09184 E 15}{1.25 E 15} i

作图

流行的例子

(x - 2) (x + 2) = x - 4

solvefor x,x^2+8xy-4y^2+3x+8y+7=0

so l v e f or x, x^{2} + 8 x y - 4 y^{2} + 3 x + 8 y + 7 = 0

4 X^{2} = 81

2 y^{2} - 3 = 0

x^2+18x+81=25+81

x^{2} + 18 x + 81 = 25 + 81