试题:
口算.
2
5
+
1
2
=
0.5×0.6÷0.5×0.6=82=0.9+0.01=
4.5-2.8-0.7=
1
4
÷0.75=
1+6÷7=
3
4
=

答案:

我来补答
2
5
+
1
2
=0.9
0.5×0.6÷0.5×0.6=0.3682=640.9+0.01=0.91
4.5-2.8-0.7=1
1
4
÷0.75=
1
3
1+6÷7=1
6
7
3
4
=
8
3
 
 
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