xy=1,x与y成______比例;x=y5,x与y成______比例;x3=4y,x与y成______比例;3x=y,x与y成______比例.
xy=1(一定),x与y成反比例;x=y5,则:y÷x=5(一定),x与y成正比例;x3=4y,则xy=3×4=12(一定),x与y成反比例;3x=y,则:xy=3(一定),x与y成反比例;故答案为:反,正,反,反.
举一反三
- 已知x-y=0,x和y成()比例;x÷6=y,x和y成()比例;x+y=3,则x和y成()比例。
- 下面关系式,( )中的x和y成反比例. A: x3=y B: 3x=y C: 3x=y D: xy=3
- 8x=y,y和x成______比例,t6=3s,t和s成______比例.
- (1)a的5倍等于b的1/3,(ab都不是0),a与b成()比例.(2)8/x=3y,那么x和y成()比例.
- 如下C程序的输出是什么?#include [stdio.h]void Func1 (int x, int y);void Func2 (int *x, int *y); int main() { int x = 3; int y = 4;Func1 (x, y); printf ("x = %d, y = %d\n", x, y);Func2(&x, &y); printf ("x = %d, y = %d\n", x, y);} void Func1 (int x, int y) { x = x + y; y = x - y; x = x - y; printf ("x = %d, y = %d\n", x, y);} void Func2 (int *x, int *y) { *x = *x + *y; *y = *x - *y; *x = *x - *y;;} A: x = 3, y = 4x = 3, y = 4x = 3, y = 4 B: x = 4, y = 3x = 4, y = 3x = 4, y = 3 C: x = 3, y = 4x = 3, y = 4x = 4, y = 3 D: x = 4, y = 3x = 3, y = 4x = 4, y = 3
内容
- 0
下列语句正确的是( ) A: If x<3*y And x>y Then y=3x B: If x<3*y And x>y Then y=x^3 C: If x<3*y : x>y Then y=x^3 D: If x<3*y And x>y Then y=x**3
- 1
下列语句正确的是________。 A: If X < 3 * Y And X > Y Then Y = X ^ 3 B: If X < 3 * Y And X > Y Then Y = X3 C: If X < 3 * Y : X > Y Then Y = X ^ 3 D: If X < 3 * Y And X > Y Then Y = X * * 3
- 2
已知y与x成正比例,如果x=2时y=1,x=3时y是(). A: 1.5 B: 2 C: 3 D: 6
- 3
y与x+1成反比例,当x=2时,y=1,则当y=-1时,x=______.
- 4
已知int x=3,y=4;,写出下列表达式的值 (1) (x,y) (2) x>y?x:y (3) x?y:x (4) (x>y)?(y>=2)?1:2:(y>x)?x:y