在( )里填上适当的两位小数。
( )＜3.1＜( )
( )＜29.09＜( )
( )＜5.7＜( )
( )＜60.5＜( )
( )＜37.6＜( )
( )＜6.08＜( )
( )＜0.125＜( )
( )＜0.98＜( )
( )＜4.11＜( )
( )＜9.06＜( )
( )＜45.2＜( )
( )＜1.482＜( )
( )＜2.51＜( )
( )＜0.35＜( )
( )＜31.09＜( )
( )＜0.55＜( )
( )＜0.909＜( )
( )＜0.25＜( )
( )＜0.1＜( )

0.64 + 0.45 =
0.93 + 0.31 =
0.45 + 0.45 =
0.9 - 0.45 =
0.9 - 0.5 =
0.63 + 0.6 =
0.6 + 0.7 =
0.39 - 0.31 =
0.87 + 0.31 =
1.4 + 0.8 =
0.89 - 0.8 =
0.5 + 0.4 =
0.67 - 0.42 =
0.4 + 0.25 =
0.72 - 0.71 =
6.2 + 3.9 =
6.91 + 0.9 =
6.3 + 3.9 =
0.97 - 0.6 =
2.1 - 0.7 =
0.72 - 0.68 =

0.3 + 0.7 - 0.5 =
0.81 + 0.19 + 3.2 =
5.3 - (2.2 + 0.8) =
0.7 + (3.2 - 1.6) =
4 - 0.5 - 3.2 =
9.6 - 9.1 + 0.5 =
1.2 + 3.3 - 0.1 =
4.9 - 0.7 - 4.2 =
0.75 - (0.06 + 0.09) =
4.3 - 2.8 - 0.7 =
2.9 + 7.1 - 3.2 =
0.36 - 0.24 + 0.12 =
0.5 + (4 - 3.6) =
9 - (7.2 + 1.8) =
5.1 + 2.7 + 0.2 =
5.1 + 2.7 - 0.2 =
7.9 + 1.7 - 7.9 =
20 - 10.5 + 9.5 =
2.87 + 39 + 7.13 =
4 + 0.05 + 0.95 =
5.6 + 3.2 + 4.4 =