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①53+39=
②89-28=
③62+18=
④84-45=
⑤35+6=
⑥90-54=
13-5= 52-4= 45-6= 6+56= 17+4-3=
15-7= 11+9= 25+7= 56-6= 42-6+20=
59+6= 60-30= 29+36= 84-60= 88-8-80=
87-8= 90-9= 55-30= 7+77= 4+88-40=
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