①
②
③ =
④ =
⑤ =
⑥ =
2×2= 2×5= 9+3= 6+1= 4×6=
450+370800 674-139545 520+280820+250
620270+350 1200800+210 189+42265-34
5+3=
8-7=
6+4=
9+1=
3+5=
树上还有几只鸟?
540+76= 291+409=
判断对错.