28×29＝77×67＝37×50＝17×31＝87×74＝15×11＝71×31＝56×41＝59×49＝96×95＝26×83＝17×68＝98×52＝40×26＝61×72＝48×93＝56×25＝49×51＝93×31＝97×81＝98×25＝18×72＝47×22＝12×38＝78×89＝...