计算：（-1）2011-|-7|+9×（7-π）0+（15）-1．_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题解答题

计算：（-1）²⁰¹¹-|-7|+

9

×（

7

-π）⁰+（

1

5

）^-1．

答案

原式=-1-7+3+5=0．

选择题

下列实验操作正确的是（　　）

A．

取用锌粒

B．

滴加液体

C．

量取9.5mL水

D．

送入固体粉末

选择题

We arrived home at 9：00 in the evening, ________most people had already had supper.[ ]

A．at that time

B．by that time

C．at which time

D．by which time