小明家九月份实际用电120千瓦•时,比计划节约了30千瓦•时,节约了百分之几?
______.
30÷(120+30),
=30÷150,
=20%.
故答案为:20%.
若2a﹣b=4,则2(b﹣2a)2﹣3(b﹣2a)+1=( )
Chan's restaurant on Baker Street,___________used to be poorly run, is now a successful
business. [ ]
A. that
B.which
C.who
D.where