问题:
(1)计算: (
27
+
1
3
)-(
12
-
1
5
+
45
);
(2)已知:(x-15) 2=169,(y-1) 3=-0.125,求
x
-
2xy
-
3
2y-x
的值.
(1)计算: (
+
)-(
-
+
);
(2)已知:(x-15) 2=169,(y-1) 3=-0.125,求
-
-
的值.
27 |
|
12 |
|
45 |
(2)已知:(x-15) 2=169,(y-1) 3=-0.125,求
x |
2xy |
3 | 2y-x |
参考答案: