题目内容
计算:.
解:原式···················· 2分
························· 4分
······························· 5分
.································· 6分
分式运算法则:先乘除后加减,同分母相加减,分母不变,分子相加减,需要注意最终结果一定是最简分式
························· 4分
······························· 5分
.································· 6分
分式运算法则:先乘除后加减,同分母相加减,分母不变,分子相加减,需要注意最终结果一定是最简分式
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