a2 |
a-b |
b2 |
a-b |
a2-b2 |
a-b |
(a+b)(a-b) |
a-b |
3x-4 |
(x-1)(x-x) |
A |
x-1 |
B |
x-2 |
1 |
1×2 |
1 |
1 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
x(x+1) |
1 |
x |
1 |
x+1 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
x(x+1) |
1 |
(x+1)(x+2) |
1 |
1×2 |
1 |
2×3 |
1 |
x(x+1) |
y+1 |
x+1 |
y |
x |
A.零 | B.正数 | C.负数 | D.整数 |
1 |
a |
1 |
a2 |
1 |
1×2 |
1 |
1 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
x(x+1) |
1 |
x |
1 |
x+1 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
x(x+1) |
1 |
(x+1)(x+2) |
1 |
(x+2)(x+3) |
1 |
(x+3)(x+4) |
1 |
1×2 |
1 |
2×3 |
1 |
x(x+1) |
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