简化:1、2*A*B/C/D=X2、A=X/2*C*D/B........(4-11)B=X/2*C*D/A........(2-1048576)C=2/X*A*B/D........(4-11)D=2/X*A*B/C........(2-1048576)2*A*B=X*C*D3、计算:(是否只需要结果正确,且尽量小,不需最小验证)任取X(10-100)枚举法:A=C=4........(4-11)D=2........(2-1048576)B=X/2*D=X..........(满足2-1048576)结果:A、B、C、D:4、X、4、2