1234+2341+3421+4123简算
问题描述:
1234+2341+3421+4123简算
答
1234+2341+3412+4123
=1000(1+2+3+4)+100(1+2+3+4)+10(1+2+3+4)+(1+2+3+4)
=10000+1000+100+10
=11110