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2+7= 7-4= 6+4= 10-7= 3+6= 8+2= 5-5= 9-8= 10-9=
3+3+3= 7+2-5= 9-2-2= 10-6+5= 9-3-5= 4+5-2= 5-2+7=
9-4+3= 8-7+8= 5+4-1= 5-0+4= 9+1-7= 5-2+6= 6+1=
(1)
□○□○□=□
(2)
□○□○□=□
(7)
(8)
□○□○□=□ 6○□○□=□
9-6= 8-2= 3+7= 10-0= 4+6= 5+5= 9-1= 9+0= 8+2=
2+6+2= 10-4+3= 7-2+4= 8+2-6= 5+5-3= 10-1-4= 8-5=
9-4-5= 9-5-2= 10-6-1= 3+4+3= 6+2+2= 5-3+6= 10-5=
?个
10个
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