问题 解答题
口算.
199+49=
10-0.01=5+1.4+1.6=2.5×40=
2
3
×
9
10
=
24÷
6
7
=
1
3
+
1
4
=
1
3
÷2÷
1
3
=
答案

199+49=248,10-0.01=9.99,5+1.4+1.6=8,2.5×40=100,
2
3
×
9
10
=
3
5
24÷
6
7
=28,
1
3
+
1
4
=
7
12
1
3
÷2÷
1
3
=
1
2

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