|
| (1)46+37+54+63 =(46+54)+(63+37) =100+100 =200; (2)25×(6×4)×5 =(25×4)×(6×5) =100×30 =3000; (3)125×7×4×2 =(125×4×2)×7 =1000×7 =7000; (4)538-72-25-3 =538-(72+25+3) =538-100 =438. |
关注公众号回复:奥数答案
即可免费获得密码查看答案

[ ]
a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35