2x2 |
y+z |
2y2 |
z+x |
2z2 |
x+y |
2x2 |
y+z |
y+z |
2 |
2y2 |
x+z |
x+z |
2 |
2z2 |
x+y |
x+y |
2 |
2x2 |
y+z |
2y2 |
z+x |
2z2 |
x+y |
2x2 |
y+z |
2y2 |
z+x |
2z2 |
x+y |
1×2 |
2×3 |
n(n+1) |
n(n+1) |
2 |
(n+1)2 |
2 |
an+1 |
an+4 |
an+2 |
an+3 |
3 |
7 |
5 |
x2 |
a |
y2 |
b |
(x+y)2 |
a+b |
1 |
2x |
9 |
1-2x |
1 |
2 |
© 2017-2019 超级试练试题库,All Rights Reserved.