2.07千米2=平方米=平方分米.
8×12.5%=
÷ =
9﹣0.54=
0.68+ +0.32=
8.8÷0.02=
﹣ =
×5.6=
3+ ﹣3+ =
105×( + + )
(3618÷18﹣145)×29
﹣4.5÷(0.2+ )
11.3﹣3.79+8.7﹣7.21.