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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>本教程(w3big.com)</title> </head> <body> <math xmlns="http://www.w3.org/1998/Math/MathML"> <mrow> <msup><mi>a</mi><mn>2</mn></msup> <mo>+</mo> <msup><mi>b</mi><mn>2</mn></msup> <mo>=</mo> <msup><mi>c</mi><mn>2</mn></msup> </mrow> </math> </body> </html>