下列不等式中是一元一次不等式的是( )
A:13x﹣y<1
B:x2+5x﹣1≥0
C:1x>3
D:12x<13﹣x
—Which subject do you like best, Nancy?
—I like____(地理) best. What about you?
分解因式:4m2﹣9n2=____.
4060 ____