20, 18, 16,, 12,,, 6
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7+8= 9+8= 6+7-3= 9-6=
10+7= 9-5+5= 6+8= 0+6=
18-8= 7+3-8= 9+9= 17-0=
19-4-3= 4+8+2= 16-3= 3+8=
5+( )=11 ( )-3=5 10-( )=7 7+4=( ) +2
(支)
(朵)
(道)
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(个)