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一、知识要点1.分数加法的意义:分数加法的意义与整数加法的意义相同,就是把两个数合并成一个数的运算。2.分数减法的意义:分数减法的意义与整数减法的意义相同,是已知两个加数的和与其中一个加数,求另一个加数的运算。3.同分母分数相加减的计算法则:同分母分数相加减,分母不变,只需分子相加减。4.异分母分数相加减的计算法则:异分母分数相加减,先通分,然后按照同分母分数加减法的法则进行计算。温馨提示:计算结果能化简的要化成最简
First, the main points of knowledge 1. The meaning of the fractional addition: The meaning of fractional addition and integer addition of the same meaning, is to combine the two numbers into a number of operations. 2. The meaning of fractional subtraction: The meaning of fractional subtraction and integer subtraction the same meaning, is known two addends and one of the addend, seeking another addend operation. 3. With the denominator of the fractional addition and subtraction of the calculation: the same denominator fraction plus minus, denominator unchanged, only the molecular subtraction. 4.Different denominator fractional addition and subtraction calculation rule: different denominator fractional addition and subtraction, the first pass, and then follow the same denominator fractional addition and subtraction method of calculation. Reminder: Calculation results can be simplified into the most simple