2+18= 18-6= 16-1= 2+12= 5+11= 17-7= 5+1= 10-1= 12+5= 11-2= 15+1= 19-11= 10+9= 16-7= 2+15= 16-15= 15+3= 9-4= 20-1= 6+8= 2+5= 13+4= 1+2= 19-6= 19-4= 3+8= 1+14= 13-3= 10+2= 12-8= 12+3= 5+2= 7+1= 7+13= 11-10= 9+9= 7+7= 20-6= 10-2= 3+3= 19-5= 11-10= 2+6= 10+1= 20-1= 2+7= 15-12= 20-3= 17-16= 9+1= 5+2= 14-1= 13+7= 3+5= 17+3= 14+3= 8+4= 4+12= 1+5= 9-8= 19-18= 6+13= 3+14= 14+3= 13+5= 2+5= 17-3= 3+7= 9-4= 20-13= 17-1= 5+6= 13+6= 6+7= 12-11= 5+8= 15-5= 20-1= 18-12= 8+6= 3+13= 1+19= 11+6= 2+10= 17-16= 1+8= 14+2= 1+12= 9+5= 8+2= 8+12= 3+17= 8+4= 1+4= 2-1= 20-18= 8+7= 20-3= 17-10= 5+6= 本文来源：https://www.wddqw.com/doc/9fdff2b006a1b0717fd5360cba1aa81144318fd3.html