过河．
8-4= 6+0= 5+2=10-9= 10-8= 8+2=
9-4= 10-3= 9-3=10-7= 7-5= 6-4=
8-5= 8+2= 9-7=4+4= 10-5= 4+2=
7-4= 9-5= 5+5= 3+3= 7-7= 8-7=
5+3= 5-3= 6-6= 8+1= 9+1= 10-4=
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