已知函数y = y1-y2,y1与x成反比例,y2与x-2成正比例,且当x = 1

已知函数y y1y2y1x成反比例,y2x2成正比例,且当x 1时,y =-1;当x 3时,y 5. ①求YX的函数关系式?②求当x5y的值。

答案

已知函数y y1y2y1x成反比例,y2x2成正比例,且①求YX的函数关系式?②求当x5y的值。

     解:①由题意 令y2 2

                y y1y      y 2

        x 1时,y =-1;当x 3时,y 5.

  1K1K2    5

3         =-4

② 当x5时,y4×(52)=

相关题目

括号内是区别下列各组常见物质的方法,其中错误的是   A.
括号内是区别下列各组常见物质的方法,其中错误的是   A.面粉和葡萄糖(加水,振荡)       B.硬水与软水(加肥皂水,振荡)   C.蒸馏水与盐水(
有如图所示的两种广告牌,其中图1是由两个等腰直角三角形
有如图所示的两种广告牌,其中图1是由两个等腰直角三角形构成的,图2是一个矩形,从图形上确定这两个广告牌面积的大小关系,并将这种大小关系用
美国南北战争中北方获得雄厚兵源,转败为胜的主要原因是 
美国南北战争中北方获得雄厚兵源,转败为胜的主要原因是           A《独立宣言》的发表                              B 林肯当选
如图所示,电源电压保持不变,当开关S闭合,甲、乙两表为
如图所示,电源电压保持不变,当开关S闭合,甲、乙两表为电压表时,两表的示数之比 U甲:U乙=5:3,则当开关S断开,甲、乙为电流表时,两表示数之
Her mother doesn't ____ of her going to study in the United States alone. A.ad
Her mother doesn't ____ of her going to study in the United States alone. A.admit          B. agree             C. prove            D. approve
Is the ‘Go to College’ Message Overdone? Even in a weak job market, the old
Is the ‘Go to College’ Message Overdone? Even in a weak job market, the old college try isn’t the answer for everyone. A briefing paper from the Brookings Institution warns that “we may
当中国出现第一个奴隶制国家的时候,那里也透射出欧洲第
当中国出现第一个奴隶制国家的时候,那里也透射出欧洲第一缕文明的曙光;当东方诞生孔子、老子等一批文化圣人的时候,那里的天空也折射出苏格
Some people think that as more and more people have televisions in their homes,
Some people think that as more and more people have televisions in their homes,      people will buy books and newspapers. A.more and more                           

最新题目