已知:x2-3x=1,求下列各式的值.(1)x2+1x2(2)x4-6x3+10x2-3x+6
已知:x2-3x=1,求下列各式的值.(1)x2+1x2(2)x4-6x3+10x2-3x+6....
已知:x2-3x=1,求下列各式的值.(1)x2+1x2(2)x4-6x3+10x2-3x+6.
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(1)∵x2-3x=1,
∴x1=
,x2=
,
∴当x1=
时,x2+
=
+
=11;
当x2=
时,x2+
=
∴x1=
3+
| ||
2 |
3?
| ||
2 |
∴当x1=
3+
| ||
2 |
1 |
x2 |
11+3
| ||
2 |
11?3
| ||
2 |
当x2=
3?
| ||
2 |
1 |
x2 |
11?3
|