//20以内进位加法分式练习
8 +4= 7 + 6 = 6 + 8 = 7+ 7=
9 +4= 6 + 6 = 7 + 8 = 9+ 7=
8 +8= 7 + 4 = 5 + 8 = 4+ 7=
8 +9= 9 + 3 = 8 + 3 = 7+ 5=
6 +5= 3 + 9 = 4 + 7 = 6+ 6=
2 +9= 9 + 6 = 9 + 9 = 5+ 7=
7 +8= 4 + 8 = 5 + 8 = 8+ 7=
8 +8= 9 + 5 = 7 + 5 = 6+ 8=
20以内退位减法分式练习
17 - 6 = 12 - 8 = 20 - 6 =
11 - 6 = 14 - 7 = 13 - 9 =
15 - 8 = 18 - 9 = 16 - 7 =
12 - 7 = 11 - 9 = 20 - 7 =
13 - 8 = 15 - 7 = 11 - 7 =
12 - 8 = 17 - 9 = 14 - 7 =
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