17.4﹣8=
5.6+4=
23+4.7=
10﹣2.3=
8.5×4=
2.3×4×0=
1000×0.44=
3.5×0.5=
0.9﹣0.63=
0.34+0.67=
0.06×0.7=
0.05×100=
96×21≈,
592÷28≈,
412×69≈.
9.9954≈(精确到0.01)