分数的简便运算4页.docx

分数的简便计算专题简析运算定律加法交换律ab = ba加法结合律abc = a（bc）减法性质1abc = acb减法性质2abc = a（bc）乘法交换律ab = ba乘法结合律（ab）c = a（bc）乘法分配律a（bc）= abac除法性质1abc = acb除法性质2abc = a（bc）除法性质3acbc =（ac）c经典例题一. “带符号搬家”。abcacbabcacbabcacbabcacbabcacbabcacbabcacbabcacbabcacb12.065.072.94 30.349.7610.34 332574 3441.7