文档介绍：62+17= 56+32= 30+29= 53+35= 73+13= 50+26=
82-61= 42-30= 49-38= 36-20= 43-33= 76-16=
43+12= 29+40= 87+15= 78+13= 41+16= 36+50=
71+6= 86-4= 96-50= 26+40= 22+66= 64-34=
1 / 6
85-26= 76-21= 34-10= 96-24= 39-12= 47-20=
39+13= 24+30= 46-40= 37-25= 46+13= 99-25=
46+32= 54-50= 87-77= 46+30= 15+81= 17+60=
62+17= 56+32= 30+29= 53+35= 73+13= 50+26=
2 / 6
82-61= 42-30= 49-38= 36-20= 43-33= 76-16=
43+12= 9+40= 87+10= 78+10= 41+16= 6+50=
71+6= 86-4= 96-50= 6+40= 22+66= 64-34=
85-80= 76-70= 34-30= 96-24= 39-30= 47-40=
3 / 6
39+30= 4+30= 46-40= 37-25= 46+3= 99-90=
46+32= 54-50= 87-77= 46+30= 5+81= 7+60=