写出一个解集是{-2},一元二次不等式______.
依题意可有:(x+2)2≤0,
故答案为(x+2)2≤0
两个三角形全等,一个三角形三边为2、5、x,另一个三角形三边为y、2、6,则x+y=______.
.Imagine what today’s life would be like if Alexander Bell the telephone more than 130 years ago!
A.didn’t invent
B.wouldn’t invent
C.hadn’t invented
D.wouldn’t have invented