例2. 5 7 3 5 8 6 4 9÷8 7 5 = ? 解:被除数去掉末三位数6 4 9后进行计算:5 7 3 5 8× (1 + ) = 1 7 5 7 3 5 8×1 = 5 7 3 5 8 + 5 7 3 5 8÷7 = 8 1 9 4 6 5 5 5 2 答案:原式 = 6 5 5 5 2 ┄┄ 6 4 9 43