问题 解答题
直接写出得数.
5
7
+
2
7
=
4
7
×
1
7
=
1
2
÷
1
3
=
7
9
-
7
18
=
1
3
=
5
2
×99+
5
2
=
1.9÷1%=0.25×0.24=20×(1+50%)=
答案

5
7
+
2
7
=1,
4
7
×
1
7
=
4
49
1
2
÷
1
3
=
3
2
7
9
-
7
18
=
7
18
1
3
=9,
5
2
×99+
5
2
=250,
1.9÷1%=190,0.25×0.24=0.06,20×(1+50%)=30.

单项选择题
单项选择题