作业帮求神人解答几道GRE数学题
来源：学生作业帮 编辑：作业帮 分类：数学作业 时间：2024/10/01 09:57:07
求神人解答几道GRE数学题
1、A political poll showed that 80 percent of those polled said they would vote for proposition P.Of those who said they would vote for proposition P,70 percent actually voted for P,and of those who did not say they would vote for P,20 percent actually voted for P.What percent of those polled voted for
(A) 56% (B) 60% (C) 64% (D) 76% (E) 90%
我列的算式是：0.8*0.7+0.2*0.2=60%,为什么答案是A呢?
2、
For the line with equation y=ax+b,ab≠0,the x-intercept is twice the y-intercept.
比大小：The slope of the line和0.5
Intercept到底要不要带正负号的啊?
3、
A rectangular floor with an area of 12 square meters is drawn to scale with 2 centimeters representing L meter.
比大小：The area of the scale drawing of the floor和24 square centimeters
4、2AF=AB=BD=DE=AE
比大小：The sum of the area of triangular region ABF and the area和The area of rectangular region BCEF
这个题目是不是错了啊?关于C的条件都没给出,图啊画不出来.
求具体算式啊!在此膜拜了!
1、A political poll showed that 80 percent of those polled said they would vote for proposition P.Of those who said they would vote for proposition P,70 percent actually voted for P,and of those who did not say they would vote for P,20 percent actually voted for P.What percent of those polled voted for
(A) 56% (B) 60% (C) 64% (D) 76% (E) 90%
我列的算式是：0.8*0.7+0.2*0.2=60%,为什么答案是A呢?
2、
For the line with equation y=ax+b,ab≠0,the x-intercept is twice the y-intercept.
比大小：The slope of the line和0.5
Intercept到底要不要带正负号的啊?
3、
A rectangular floor with an area of 12 square meters is drawn to scale with 2 centimeters representing L meter.
比大小：The area of the scale drawing of the floor和24 square centimeters
4、2AF=AB=BD=DE=AE
比大小：The sum of the area of triangular region ABF and the area和The area of rectangular region BCEF
这个题目是不是错了啊?关于C的条件都没给出,图啊画不出来.
求具体算式啊!在此膜拜了!
1.就应该是60%,答案错了
2.intercept表示截距,有符号,可以为负,所以应该选D（不确定）
3.原题是1meter不是Lmeter,题目意思是
一个长方形floor,面积12平方米,按比例,2厘米代表1米
则比较其面积与24cm²的大小
由比例尺1：50,则面积比例为1：50²=1：2500
则易得120000/2500=48>24
选A
4.你的题不完整
原题是
2AF=AB=BD=DE=AE,
A,The sum of the area of triangular region ABF and the area of triangular region CDE
B,The area of rectangular region BCEF'
由题中AB=BD=DE=AE可知 四边形ABDE为菱形,A,D位于线段BE的垂直平分线上
又BCEF为矩形（rectangular）
画图后得到,随菱形ABDE变化,矩形BCEF也在变化
有点儿复杂,我算一会再跟你说
2.intercept表示截距,有符号,可以为负,所以应该选D（不确定）
3.原题是1meter不是Lmeter,题目意思是
一个长方形floor,面积12平方米,按比例,2厘米代表1米
则比较其面积与24cm²的大小
由比例尺1：50,则面积比例为1：50²=1：2500
则易得120000/2500=48>24
选A
4.你的题不完整
原题是
2AF=AB=BD=DE=AE,
A,The sum of the area of triangular region ABF and the area of triangular region CDE
B,The area of rectangular region BCEF'
由题中AB=BD=DE=AE可知 四边形ABDE为菱形,A,D位于线段BE的垂直平分线上
又BCEF为矩形（rectangular）
画图后得到,随菱形ABDE变化,矩形BCEF也在变化
有点儿复杂,我算一会再跟你说