用0--9这些数使下式成立,□×□＋□□×□□＋□＋□□=2002。顺便问解这题有什么技巧吗？

一共72个解：
9×1+56×34+7+82=2002
9×1+56×34+2+87=2002
9×1+34×56+7+82=2002
9×1+34×56+2+87=2002
8×4+52×36+7+91=2002
8×4+52×36+1+97=2002
8×4+36×52+7+91=2002
8×4+36×52+1+97=2002
7×5+69×28+4+31=2002
7×5+69×28+1+34=2002
7×5+28×69+4+31=2002
7×5+28×69+1+34=2002
7×1+56×34+9+82=2002
7×1+56×34+2+89=2002
7×1+34×56+9+82=2002
7×1+34×56+2+89=2002
6×4+51×37+2+89=2002
6×4+51×37+9+82=2002
6×4+37×51+9+82=2002
6×4+37×51+2+89=2002
5×7+69×28+4+31=2002
5×7+69×28+1+34=2002
5×7+28×69+4+31=2002
5×7+28×69+1+34=2002
5×4+67×29+8+31=2002
5×4+67×29+1+38=2002
5×4+29×67+8+31=2002
5×4+29×67+1+38=2002
4×8+52×36+7+91=2002
4×8+52×36+1+97=2002
4×8+36×52+7+91=2002
4×8+36×52+1+97=2002
4×6+51×37+9+82=2002
4×6+51×37+2+89=2002
4×6+37×51+2+89=2002
4×6+37×51+9+82=2002
4×5+67×29+8+31=2002
4×5+67×29+1+38=2002
4×5+29×67+8+31=2002
4×5+29×67