-0.5=
15×=
4÷=
90×80%=
1-23%=
0.9×=
×35=
×0=
=
3.5×=
8.9÷0.89=
10-0.98=
25×0.4=
×4= 5.4×= ×= ×= ××=
÷4= 6÷= ÷= ÷= 1-×=
□×□-□
□×□○□=□