分数加减乘除法的计算法则：

1.同分母分数加减的法则：同分母分数相加减，分母不变，只把分子相加减。

2.同分母带分数加减的法则：带分数相加减，先把整数部分和分数部分分别相加减，再把所得的数合并起来。

3.异分母分数加减的法则：异分母分数相加减，先通分，然后按照同分母分数加减的法则进行计算。

4.分数乘整数的计算法则：分数乘整数，用分数的分子和整数相乘的积作分子，分母不变。

5.分数乘分数的计算法则：分数乘分数，用分子相乘的积作分子，分母相乘的积作分母。

6.一个数除以分数的计算法则：一个数除以分数，等于这个数乘以除数的倒数。

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