40×70=2800,
1
2 +
1
3 =
5
6 ,
5
6 -
2
3 =
1
6 , 3600÷18=200, 3.14×9=28.26,
0.25×4=1, 5.4-3
1
5 =2.2,
1
4 +
1
4 -
1
4 +
1
4 =
1
2 . 故答案为:2800,
5
6 ,
1
6 ,200,28.26,1,2.2,
1
2 .
40×70=2800,
1
2 +
1
3 =
5
6 ,
5
6 -
2
3 =
1
6 , 3600÷18=200, 3.14×9=28.26,
0.25×4=1, 5.4-3
1
5 =2.2,
1
4 +
1
4 -
1
4 +
1
4 =
1
2 . 故答案为:2800,
5
6 ,
1
6 ,200,28.26,1,2.2,
1
2 .