①x-x=
②:x=:
③x+45×=12
①1300﹣497=
②0.81+15.3=
③=
④30%×=
⑤=
⑥14:0.7=
⑦2.4÷=
⑧1÷﹣÷1=
5.34+0.66=
101×30=
0.4+6.0=
+=
5÷0.05=
×=
-=
13÷=
54×=
①×× ②+÷
③0.38×99+38% ④-(-)