来自宋建海的问题
简便计算：1234+2341+3412+4123=?1234+2341+3412+4123=1x1000+1x100+1x10+1+2x1000+2x100+2x10+2+3x1000+3x100+3x10+3+4x1000+4x100+4x10+4=1111+2222+3333+4444=9999
简便计算：1234+2341+3412+4123=?
1234+2341+3412+4123=1x1000+1x100+1x10+1+2x1000+2x100+2x10+2+3x1000+3x100+3x10+3+4x1000+4x100+4x10+4=1111+2222+3333+4444=9999
1回答
2020-04-26 16:01