问题 解答题
直接写出得数:
3511-399=______
4.97+5.3=______2.5×1.6=______
2
3
÷
1
4
-
1
4
÷
2
3
=______
1.9×5.1≈______31.9÷8.1≈______0.32-0.23=____________:
1
3
=
1
3
答案

3511-399=3112,4.97+5.3=10.27,2.5×1.6=4,
2
3
÷
1
4
-
1
4
÷
2
3
=
55
24
1.9×5.1≈10,31.9÷8.1≈4,0.32-0.23=0.082,
1
9
1
3
=
1
3

单项选择题
单项选择题