A:a≠0
B:a≠1
C:a≠﹣1
D:a≠±1
- What do you think of the dish I cooked for you?
- I haven't had it yet. However, it good.
下列句子有语病的一项是( )
观察下列等式
12=1= 16 ×1×2×(2+1)
12+22= 16 ×2×3×(4+1)
12+22+32= 16 ×3×4×(6+1)
12+22+32+42= 16 ×4×5×(8+1)…
可以推测12+22+32+…+n2=____.