Question

简算。

（1）9999×7778+3333×6666

（2）5.6×69.32+138.64×0.05+693.2×0.43

Answer 1

（1）原式=9999×（7778+2222）
                =99990000

（2）原式=5.6×69.32+69.32×0.1+69.32×4.3
                =69.32×10
                =693.2