①450÷18×25
②3.7×99
③1-[ +( - )]
④ × + ÷
9×9%= ×60%= 125%÷25%= 0.2×0.3=
5π= 0.53= 0.062= 12.56÷3.14=
0.26×101=
14÷3.5=
4.8×37.5%=
0.32=
10.3-1.03=
2.5-0.25÷0.5=
203+596≈ 675-398≈ 79×61≈ 5398÷89≈
﹣1.7,﹣3,+ , 120%