问题
选择题
若(x+y﹣5)2+(xy﹣6)2=0,则(x+y)2﹣2xy的值为[ ]
A.13
B.26
C.28
D.37
答案
答案:A
若(x+y﹣5)2+(xy﹣6)2=0,则(x+y)2﹣2xy的值为[ ]
A.13
B.26
C.28
D.37
答案:A
小题1:“ ” can tell you what to do if you are tired of a subject. A、Study Skills for Life B、Learning How to Learn C、Basic Study Guidebook 小题2:Many pictures in the book “Learning How to learn” can . A、make children read slowly B、make children understand the book easily C、make children draw beautifully 小题3:According to the ads, the three books are for . A、the old B、parents C、children 小题4:If you buy the three books on May 2nd, 2010, you will just pay for them. A、$93 B、$80 C、$79 小题5:The purpose of the three ads is to . A、sell these books to the children B、help children learn English C、help children learn about nature |