350×0.02=7, 1-25%=0.75, 1+15%=1.15, 12-7.9=4.1,
7
9 ×
3
7 =
1
3 ,
2
3 -
1
2 =
1
6 , (
7
8 -
2
3 )×24=5, 16×
3
4 =12,
131131÷131=1001,
7
15 ×
1
18 ×0=0, 1÷
1
10 -
1
10 ÷1=9.9 12.5×0.08=1,
0.9+99×0.9=90, 7.8×0.25×4=7.8,
7
9 -
5
6 +
2
9 =
1
6 , 0.52×100=52,
5
4 ×8+8×
1
4 =12,
7
9 ×21×
9
14 =
21
2 , 98-0.23-0.77=97,
7
8 +
7
8 ÷
7
8 =
15
8 = 1
7
8 ,
44÷
11
10 =40, 9300÷5÷6=310, 0÷
1
50 =0, 1997+1998+1999+6=6000.