1[] 2 []3[] 4 []5 []6[] 7[] 8[] 9=2009 []填加减乘除

问题描述:

1[] 2 []3[] 4 []5 []6[] 7[] 8[] 9=2009 []填加减乘除

[(6+7)*4-1+2-3]*5*8+9

(1-2+3)x4x5x(6x7+8)+9=2009