设D是由y=x，y=2x，y=1围成，则[img=104x46]180fef7b144981f.png[/img]=______．
举一反三
- 设区域D由直线 y=x, y=-x 和 x=1 围成, 则 [img=214x60]1803b63c14369c7.png[/img]
- 设 D 是由 y=x, y=2x, [img=45x39]1803b63c6f418dd.png[/img] 所围成的区域, 则 [img=180x60]1803b63c798faec.png[/img]
- 设\(D\)是由直线\(y = x,y = x + 1,y = 1\)及\(y=3\)所围成的区域，则二重积分\(\iint\limits_D {({x^2} + {y^2} - y)dxdy = }\)______
- 如下程序的输出是什么？ #include [stdio.h] void Swap (int x, int y); int main() { int x = 1; int y = 2; printf ("x=%d,y=%d\n", x, y); Swap (x, y); printf ("x=%d,y=%d", x, y); } void Swap (int x, int y) { int temp; temp = x; x = y; y = temp; printf ("x=%d,y=%d\n", x, y); } A: x=1,y=2x=2,y=1x=2,y=1 B: x=1,y=2x=1,y=2x=2,y=1 C: x=1,y=2x=2,y=1x=1,y=2 D: x=1,y=2x=1,y=2x=1,y=2
- 如下程序的输出是什么？ #include <stdio.h> void Swap (int x, int y);int main() { int x = 1; int y = 2; printf ("x=%d,y=%d\n", x, y); Swap (x, y); printf ("x=%d,y=%d", x, y); } void Swap (int x, int y) { int temp; temp = x; x = y; y = temp; printf ("x=%d,y=%d\n", x, y); }? x=1,y=2x=2,y=1x=2,y=1|x=1,y=2x=1,y=2x=2,y=1|x=1,y=2x=2,y=1x=1,y=2|x=1,y=2x=1,y=2x=1,y=2