问题 解答题
直接写得数.
2.5×4=
12.5×0.8=0.25×0.04=0.5×20=
7.2÷4=
7
8
-
4
8
=
1-
5
9
=
2
3
+
1
3
=
答案

2.5×4=10; 12.5×0.8=10; 0.25×0.04=0.1; 0.5×20=10;

7.2÷4=1.8;

7
8
-
4
8
=
3
8
; 1-
5
9
=
4
9
2
3
+
1
3
=1.

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