①24×()
②×17
③
④
⑤
783+199=
494-298=
-=
+=
0.5+=
×=
÷=
1÷25%=
99×9+99=
2-15%=
×12= 1÷= ÷= 0×=
×= 24×= ÷6= ×2.4=
①
②
⑥