0.4÷40%=1, 0.64+3.6=4.24, 0.25×4=1,
0.56×
1
8 =0.07,
1
5 ×
1
5 =
1
25 , 5.6÷0.1%=560,
4
9 ÷2=
2
9 ,
9
25 ×
2
3 =
6
25 ,
3
8 ÷3+3÷
3
8 =8
1
8 ,
6.73×99+6.73=673.
0.4÷40%=1, 0.64+3.6=4.24, 0.25×4=1,
0.56×
1
8 =0.07,
1
5 ×
1
5 =
1
25 , 5.6÷0.1%=560,
4
9 ÷2=
2
9 ,
9
25 ×
2
3 =
6
25 ,
3
8 ÷3+3÷
3
8 =8
1
8 ,
6.73×99+6.73=673.