1.52-0.5=
+=
×=
10-5.5=
15.6÷3=
×3=
3.6÷=
1÷×=
①x+x=6
②40%x-28=52
③∶x=3∶12
①5.27-1.57-3.43+4.73
②÷7+×
③12÷[5.6×(-)]