62×5=
33×50=
4200÷7=
0÷80=
650÷8≈
146÷7≈
98×53≈
67×88≈
25×40=
40×60=
36×11=
42×48=
46×2=
450÷9=
408×3=
1吨-600千克=
①7.4﹣6.62+20.6﹣13.38
②×+×
③(-+)÷
④2×0.8×12.5×50%
⑤÷(÷+)
⑥×[1÷(+)]