题目内容
已知x2-2=0,求代数式
+
的值.
| (x-1)2 |
| x2-1 |
| x2 |
| x+1 |
原式=
+
=
+
=
;
∵x2-2=0,∴x2=2;
∴原式=
=1.
| (x-1)2 |
| (x-1)(x+1) |
| x2 |
| x+1 |
=
| x-1 |
| x+1 |
| x2 |
| x+1 |
=
| x2+x-1 |
| x+1 |
∵x2-2=0,∴x2=2;
∴原式=
| 2+x-1 |
| x+1 |
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