53+23= 86-43= 14+64= 76-16= 97-42= 34+54=
17+50= 57﹣30= 70+3= 11﹣8= 26+22=
99﹣98= 30+50= 22+7= 67+4= 75﹣15=
12+15= 23+32= 55-43= 33-13= 99-98=
25+45= 22-11= 88-36= 36-16= 15+85=