547+198=
0.6-0.28=
5.5×=
3.6÷0.36=
7.7÷=
=
×5÷×5=
3.5+4.5=
3.6÷40%=
4r2-22=
2.01-0.1=
20×15%=
×24 × +
× - × ×(1- )