苹果是梨的多少倍？
4-2= 10-5= 4-3=2-2= 2-1= 6-5=
6-3= 5-3= 6-6= 8-1= 9-1= 10-4=
8-4= 9-5= 5-5= 3-3= 7-7= 8-7=
9-4= 8-2= 9-7=4-4= 10-5= 4-2=
8-5= 10-3= 9-3=10-7= 7-5= 6-4=
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