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                * [bcadd](https://www.php.net/manual/zh/function.bcadd.php "bcadd")(string`$num1`,string`$num2`,?int`$scale`\=**`null`**):兩個任意精度數字的**加法**計算 * [bcsub](https://www.php.net/manual/zh/function.bcsub.php "bcsub")(string`$num1`,string`$num2`,?int`$scale`\=**`null`**):兩個任意精度數字的**減法** * [bcmul](https://www.php.net/manual/zh/function.bcmul.php "bcmul")(string`$num1`,string`$num2`,?int`$scale`\=**`null`**):兩個任意精度數字**乘法**計算 * [bcdiv](https://www.php.net/manual/zh/function.bcdiv.php "bcdiv")(string`$num1被除數`,string`$num2除數且不能為0否則返回null`,?int`$scale`\=**`null 保留的小數點`**):兩個任意精度的數字**除法**計算 * [bccomp](https://www.php.net/manual/zh/function.bccomp.php "bccomp")(string`$num1`,string`$num2`,?int`$scale`\=**`null`**):比較兩個任意精度的數字 。 兩個數相等時返回 0;`num1`比`num2`大時返回 1; 其他則返回 -1 * [bcmod](https://www.php.net/manual/zh/function.bcmod.php "bcmod")(string`$num1`,string`$num2`,?int`$scale`\=**`null`**):任意精度數字取模 * [bcpow](https://www.php.net/manual/zh/function.bcpow.php "bcpow")(string`$num`,string`$exponent`,?int`$scale`\=**`null`**):任意精度數字的乘方 * [bcpowmod](https://www.php.net/manual/zh/function.bcpowmod.php "bcpowmod"):將一個任意精度數提高到另一個,并按指定的modu降低 * [bcscale](https://www.php.net/manual/zh/function.bcscale.php "bcscale")(int`$scale`):設置/獲取所有 bc math 函數的默認小數點保留位數 * [bcsqrt](https://www.php.net/manual/zh/function.bcsqrt.php "bcsqrt")(string`$num`,?int`$scale`\=**`null`**):任意精度數字的二次方根
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