题目

先化简，再求值： 1－÷,其中x=－2. 答案：【答案】1－【解析】按照运算顺序，先算除法，再算减法化简后代入数值即可.原式= = = 当x=－2时，原式= How can you go to the cinema since you have so ______ to do ? [　　] A．many homeworks B．much homework C．few homeworks D．so little homework