搜索
才径谷 >中学 >试题列表
当前分类:

中学

当y=______时代数式y-y-12与代数式2-y+23的值相等.
查看答案
已知|y-3|与(x+2)2互为相反数,则x、y的值分别为[]
A.-3,2B.3,-2C.2,3D.-2,3
查看答案
若一次函数y=kx-3与y=x+1的图象以及y轴围成的三角形的面积为8,则k=()。
查看答案
已知xn=2,yn=3,则(xy)n=______.
查看答案
如果不等式(a+3)x>a+3的解集是x<1,那么a的取值范围是()
查看答案
a2+b2=5,ab=2,则(a+b)2=()
查看答案
(-5)+(21)+(5)用简便方法计算可将原式化为(),计算结果为()
查看答案
一件夹克标价为a元,现按标价的7折出售,则实际售价用代数式表示为______元.
查看答案
在式子x-y2,3a,1-mm-1,xπ,y3y2,13中,分式的个数是()
A.3个B.4个C.5个D.6个
查看答案
不等式23x-4>6的解集是()
A.x>15B.x≥15C.x<15D.x≤15
查看答案
一种计算机每秒可做4×108次运算,它工作3×103秒运算的次数为()
A.12×1024B.1.2×1012C.12×1012D.12×108
查看答案
某种品牌的彩电价格下调20%以后,每台售价为a元,则该品牌彩电每台原价应为()
A.0.8a元B.0.2a元C.a0.2元D.a0.8元
查看答案
若(x-1)(x+1)="x2"+px-1,则p的值是_____
查看答案
甲、乙两个工程队共同完成一项工程,乙队先单独做1天,再由两队合作2天就完成全部工程,已知甲队与乙队的工作效率之比是3:2,求甲、乙两队单独完成此项工程各需多少天?
查看答案
根据以下资料,回答下列各题。 It is widely known that any English conversation begins with The Weather.Such a fixation with the weather finds expression in Dr.Johnson’s famous comment that “When two English meet, their first talk is of weather.” Though Johnson’s observation is as accurate now as it was over two hundred years ago, most commentators fail to come up with a convincing explanation for this English weather-speak. Bill Bryson, for ezample, concludes that,as the English weather is not at all exciting,the obsession with it can hardly be understoo D.He argues that”To an outsider,the most striking thing about the English weather is that there is not very much of it.” Simply, the reason is that the unusual and unpredictable weather is almost unknown in the British Isles. Jeremy Paxman, however, disagrees with Bryson, arguing that the English weather is by nature attractive.Bryson is wrong, he says,because the English preference for the weather has nothing to do with the natural phenomen
A.”The interest is less in the phenomena themselves, but in uncertainty.” According to him, the weather in England is very changeable and uncertain and it attracts the English as well as the outsider. Bryson and Paxman stand for common misconceptions about the weather-speak among the English.Both commentators, somehow, are missing the point.The English weather conversation is not really about the weather at all.English weather-speak is a system of signs ,which is developed to help the speakers overcome the natural reserve and actually talk to each other.Everyone knows conversations starting with weather-speak are not requests for weather data.Rather, they are routine greetings,conversation starters or the blank”fillers”, In other words, English weather-speak is a means of social bonding. The author mentions Dr.Johnson’s comment to show that________.
A.most commentators agree with Dr.JohnsonB.Dr.Johnson is famous for his weather observationC.the comment was accurate two hundred years agoD.English conversations usually start with the weather
查看答案
3-2的绝对值是______.
查看答案
若冬天某日最低气温为“-3℃”,则它的意义是()
A.零上3℃B.零下3℃C.比最低气温多3℃D.经最高气温少3℃
查看答案
下列各组数中,互为相反数的一组是()
A.-2与4B.2与38C.-2与-12D.|-2|与2
查看答案
分解因式:4a2-b2=______.
查看答案
一个两位数的数字之和是7,这个两位数减去27,它的十位和个位上的数字就交换了位置,则这个两位数是()。
查看答案