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fix warnings(markdown rebuild)
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docs/userland/libc/apis/api-list/math.md
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docs/userland/libc/apis/api-list/math.md
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# math.h
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## 简介:
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数学库
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## 函数列表:
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``double fabs(double x)`` : 返回 x 的绝对值
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``float fabsf(float x)`` : 返回 x 的绝对值
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``long double fabsl(long double x)``: 返回 x 的绝对值
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``double round(double x)`` 四舍五入 x
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``float roundf(float x)`` 四舍五入 x
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``long double roundl(long double x)`` 四舍五入 x
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``int64_t pow(int64_t x,int y)`` 返回 x 的 y 次方
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