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Line 45:
Line 45: − + +
→======Demo
<math>\sqrt{45}</math>
<math>\sqrt{45}</math>
<math>\sum_ x</math>
<math>\sum_ x</math>
<math>\frac{\sum {x}}{n}</math>
<math>\frac{\sum {x}}{n}={\bar x} </math>
<math>\A subset B</math>