题目

下列各式的变形中，正确运用等式性质的是（） A . 由 得x=2 B . 由 =3得x=1 C . 由﹣2a=﹣3得a= D . 由x﹣1=4得x=5 答案：DThis pink sweater is much than that blue one, so Kate′s mother will buy the pink one.A. most expensiveB. cheaperC. expensiveD. cheap