第一章计算题训练基础篇知识要点:1、熟记分数和小数百分数最简比互化中的常见数 1/8=0.125,1/4=0.25,3/8=0.375,1/2=0.5,5/8=0.6253/4=0.75,7/8=0.8752掌握简便运算技巧加法交换律和结合律a+b=b+a (a+b)+c=a+(b+c)乘法交换律,结合律,分配律ab=ba (ab)c=a(bc) (a+b)c=ac+bc (a-b)c=ac-bc除法分配律 (a+b)c=ac+bc (a-b)c=ac-bca-b-c=a-(b+c) a-(b-c)=a-b+c abc=a(bc)3平方差公式:4 熟记100以内质数:2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,975 熟记1-20的平方 1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,4001-10的立方1,