题目内容
已知x,y是实数,且
=2,y=
+
+
,求
-4y+4-(x-2+
)2-z的值.
3 | z |
x-2 |
2-x |
1 |
4 |
y2 |
2 |
∵
=2,
∴z=8,
∵y=
+
+
,
∴x=2,y=
,
∴
-4y+4-(x-2+
)2-z
=
-4×
+4-(2-2+
)2-8
=
-1+4-(
)2-8
=
-1+4-2-8
=-6
.
3 | z |
∴z=8,
∵y=
x-2 |
2-x |
1 |
4 |
∴x=2,y=
1 |
4 |
∴
y2 |
2 |
=
1 |
4 |
1 |
4 |
2 |
=
1 |
4 |
2 |
=
1 |
4 |
=-6
3 |
4 |
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