二、数的计算（一）整数、小数、分数四则运算「复习要求］回．熟练掌握整数、小数、分数四则运算的意义、法则，能正确、迅速地进行整数、小数分数的四则运算。２．深入理解加法与减法、乘法与除法之间的互逆关系，能正确、熟练的进行验算和求未知数Ｘ。３．理解和掌握整... Second, the number of calculations (a) integers, decimals, scores four operations “review requirements” back. Proficient in integers, decimals, fractions of the four operations of the meaning, the law, can correctly and quickly integer, decimal fraction of the four operations. In-depth understanding of the reciprocal relationship between addition and subtraction, multiplication and division, can be correct and skilled in checking and seeking the unknown X. 3. Understand and master the whole...