4.25+5.75=
10﹣0.01=
0.8×0.4=
105×4=
27+68=
× =
72÷ =
6.3+0.1=
398×5≈
538÷9≈
①65×98
②2.5×24×0.5
③( )×48
④ +[( ﹣ )× ]