14 | | <?xml version="1.0" encoding="UTF-8"?> |
15 | | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" |
16 | | "http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd" > |
17 | | |
18 | | <math display="block"> |
19 | | <mrow> |
20 | | <mi>x</mi> |
21 | | <mo>=</mo> |
22 | | <mfrac> |
23 | | <mrow> |
24 | | <mo form="prefix">−</mo> |
25 | | <mi>b</mi> |
26 | | <mo>±</mo> |
27 | | <msqrt> |
28 | | <msup> |
29 | | <mi>b</mi> |
30 | | <mn>2</mn> |
31 | | </msup> |
32 | | <mo>−</mo> |
33 | | <mn>4</mn> |
34 | | <mo>⁢</mo> |
35 | | <mi>a</mi> |
36 | | <mo>⁢</mo> |
37 | | <mi>c</mi> |
38 | | </msqrt> |
39 | | </mrow> |
40 | | <mrow> |
41 | | <mn>2</mn> |
42 | | <mo>⁢</mo> |
43 | | <mi>a</mi> |
44 | | </mrow> |
45 | | </mfrac> |
46 | | </mrow> |
47 | | </math> |
48 | | }}} |