凑十法练习题全部

9+ 6 =9+ 5 =9+4=9+ 3 =9+ 2 =9+ 7 =9+ 8 =9+ 9 =8+ 8 =8+ 7 =8+9=8+6=8+ 5=8+ 4=8+

腾讯文库凑十法练习题全部