Question

！！！急急！！求各位大侠、数学高手帮忙啊！！下午就要用到的！！！！简便运算！有10悬赏啊！！！！！！！

63×27＋19×21 624*48/312/8 406*312/104/203

Answer 1

63*27+19*21
=7*9*3*9+19*3*7
=21(9*9+19)
=21(81+19)
=21*100
=2100

624*48/312/8
=2*48/8
=12

406*312/104/203
=406*3*104/104/203
=406*3/203
=6

Answer 2

63×27+19×21=21×(19+81)=2100
624×48/312/8=624/312×48/8=2×6=12
406×312/104/203=406/203×312/104=2×3=6

追问

呵呵
不用了

Answer 3

63×27＋19×21 =21×3×27+19×21=21×(81+19)=21×100=2100
624*48/312/8=312*2*6*8/312/8=2*6=12
406*312/104/203=203*2*104*3/104/203=2*3=6