2b2 |
a+b |
2x+1 |
4x-1 |
x+1 |
1-4x |
5x-4 |
4x-1 |
2b2 |
a+b |
b(a+b) |
a+b |
a(a+b) |
a+b |
2b2-ab-b2+a2+ab |
a+b |
a2+b2 |
a+b |
2x+1 |
4x-1 |
x+1 |
4x-1 |
5x-4 |
4x-1 |
8x-2 |
4x-1 |
1 |
1×3 |
1 |
2 |
1 |
3 |
1 |
3×5 |
1 |
2 |
1 |
3 |
1 |
5 |
1 |
5×7 |
1 |
2 |
1 |
5 |
1 |
7 |
1 |
1×3 |
1 |
3×5 |
1 |
5×7 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
5 |
1 |
2 |
1 |
5 |
1 |
7 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
5 |
1 |
5 |
1 |
7 |
1 |
2 |
1 |
7 |
3 |
7 |
1 |
x(x+3) |
1 |
(x+3)(x+6) |
1 |
(x+6)(x+9) |
1 |
a(a+1) |
1 |
(a+1)(a+2) |
1 |
(a+2)(a+3) |
1 |
(a+2006)(a+2007) |
x+1 |
y+1 |
y |
x |
A.0 | B.正数 |
C.负数 | D.以上情况都有可能 |
x |
y |
y |
x |
x2+y2 |
xy |
1 |
a |
1 |
b |
1 |
2 |
ab |
a-b |
1 |
R |
R1+R2 |
R1R2 |
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