2a |
a-1 |
1 |
a+1 |
a2-1 |
a |
1 |
x-3 |
x |
3-x |
2a |
a--1 |
a2-1 |
a |
a |
a+1 |
a2-1 |
a |
2a |
a-1 |
(a+1)(a-1) |
a |
a |
a+1 |
(a+1)(a-1) |
a |
2a(a+1)-a(a-1) |
a2-1 |
a2-1 |
a |
a2+3a |
a2-1 |
a2-1 |
a |
a2+3a |
a |
1 |
4 |
x-1 |
x-4 |
m |
x-4 |
A.4 | B.3 | C.-3 | D.1 |
x2 |
2x-5 |
5 |
5-2x |
m |
x-5 |
A.方程的解是x=m+5 |
B.m>-5时,方程的解是正数 |
C.m<-5时,方程的解为负数 |
D.无法确定 |
3 |
x |
5 |
x+2 |
6 |
(x+1)(x-1) |
m |
x-1 |
A.0 | B.1 | C.-1 | D.1和-1 |
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