计算：（2-1）0+（-13）-1-4sin45°+8．_爱下问搜题

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问题解答题

计算：（

2

-1）⁰+（-

1

3

）^-1-4sin45°+

8

．

答案

原式=1-3-4×

2

2

+2

2

=-2．

选择题

I’m completely _______ at the way _______ his wife has treated him.

A．dismissed; that

B．disliked; in which

C．disgusted; /

D．discontented; which

填空题

闸阀的密封性能比（）要好。