#1
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#2
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$$\int_{a}^{b}\ f(x)dx$$ ¡ç¤×;×é¹·Õèãµé¡ÃÒ¿ ¢Í§ àÊé¹ curve f(x) 㹪èǧ (a,b)
â´Â·Õè f µéͧà»ç¹ piecewise continuous function 㹪èǧà´ÕÂǡѹ |
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