请展开查看知识点列表
9+50= 30+3= 37-20= 5+8-4= 17-8+5=
13-6= 15-9= 7+9-8= 49-40+60= 85-5+9=
17–9= 12–5= 40+5= 20+60= 16-7=
35–5= 19-6= 6+8= 15-9= 80–50=
40+30= 64–60= 77–70+2= 55–5+3= 12+8+7=
进入组卷