If you're seeing this message, it means we're having trouble loading external resources on our website.

如果你被网页过滤器挡住,请确保域名*.kastatic.org 和 *.kasandbox.org 没有被阻止.

要登录及使用可汗学院的所有功能,请在您的浏览器中启用 JavaScript.

主要内容

二次方程公式

解答下题.

6, plus, 2, x, squared, minus, 3, x, equals, 8, x, squared

(选择 A)
x, equals, 3, comma, minus, start fraction, 1, divided by, 2, end fraction
(选择 B)
x, equals, start fraction, 5, plus minus, square root of, 57, end square root, divided by, 16, end fraction
(选择 C)
x, equals, start fraction, 1, plus minus, square root of, 17, end square root, divided by, minus, 4, end fraction
(选择 D)
x, equals, start fraction, minus, 4, plus minus, square root of, 34, end square root, divided by, 3, end fraction

不会做了？

不会做了？