问题 解答题
直接写出得数
900-199=237+163=
1
4
+
1
5
=
2-
3
4
=
3+0.3=
0.39×10=8.4÷4.2=0.32=25×4÷5=1-
4
9
+
5
9
=
答案

900-199=701,237+163=400,
1
4
+
1
5
=
9
20
2-
3
4
=1
1
4
3+0.3=3.3,
0.39×10=3.9,8.4÷4.2=2,0.32=0.09,25×4÷5=20,1-
4
9
+
5
9
=
10
9

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