x2-1 |
x2+x-2 |
A.1 | B.-1 | C.1或-1 | D.-2或-1 |
(x-1)(x+1) |
(x-1)(x+2) |
A.只要分式的分子为零,则分式的值为零 | ||
B.分子、分母乘以同一个代数式,分式的值不变 | ||
C.分式的分子、分母同时变号,其值不变 | ||
D.当x<1时,分式
|
1 | ||
|
A.x≠0 | B.x≠1且x≠0 | C.x≠0或x≠±1 | D.x≠0且x≠±1 |
(x+8)(x-1) |
|x|-1 |
A.8或-1 | B.-1 | C.-8 | D.1或-8 |
a-b |
a+b |
x |
2x-4 |
A.x=2 | B.x≠2 | C.x=-2 | D.x≠0 |
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