摘要:70+20= 14-9= 50-10= 60-30= 100-60= 40+20= 60+40= 18-9= 20+30= 100-10= 40+30= 13-8= 30-30= 70-30= 20+50= 40-10+70= 50+10-60= 17-8-9= 7+6-5= 40+40-70= 60-50+6= 15-6+8= 11-7+8=
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