9999x77778+3333x6666=9999x77778+9999x2222=9999 x（77778+2222）=9999x80000=7999200005.6x69.32+138.64x0.05+693.2x0.43=69.32x（5.6+0.1+4.3）=69.32x10原创答案哦!=693.2