25+1926+19 70-35 70-25 90-1090-20
36+3536+34 40+3025+20 38-2845-35
47+30= 25+6= 71-41= 72-58= 66-8=
64-7= 50+35= 70-34= 92-4= 50-20+35=
①47+39=
②26+41=
③77-29=
④98-24=
⑤17+28=
⑥80-12=