13-4= 18-8= 9+10= 77-7 = 20+8=
60+6= 7+40= 16-8= 11-5 = 14-7=
20+7= 86-6= 15-9= 13-4-5= 3+9=5=
花坛里原有多少棵花?
( )
=(根)
10+30= 12-5= 80+6= 13-4=
14-5= 30+5= 15-7= 9+40=
8+9= 16-9= 10+0= 17-8=
18-9= 60+6= 45-5= 7+70=