扫描二维码，直接登录
题库 / Prep2007E1-DS-181
In the figure shown, what is the value of x ?
(1) The length of line segment QR is equal to the length of line segment RS.
(2) The length of line segment ST is equal to the length of line segment TU.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
求X的度数？
（1）QR=RS 只知道rqs这个三角形是等腰三角形；不充分
（2）ST=TU 只知道tsu这个三角形是等腰三角形；不充分
联立：Lrqs=Lrsq
Lsut=Lust
180=Lrsq+X+Lust=Lrqs+Lsut+x(1)
sqp+x+90+sup=360
又因为：180-sut=sup
180-rqs=sqp
所以180-rqs+x+90+180-sut=360(2)
联立1 2：x=45度
充分
登录 或 注册 后可以参加讨论