某人在15分钟内能打工个宇，那他以同样的速度打完y个字需要多少小时( )
A: 15y/x
B: x/15y
C: 4x/y
D: y/4x
A: 15y/x
B: x/15y
C: 4x/y
D: y/4x
举一反三
- 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
- (4)()#include()extern()serial_initial()();()main()(){()int()a,b();()unsigned()int()x,y();()serial_initial()();()a=b=0xaa55();x=y=0xaa55;()printf("\n()a=%4x()b=%4x()x=%4x()y=%4x",a,b,x,y)();()a=a<<1();b=b>>1;()x=x<<1();y=y>>1;()printf("\n()a=%4x()b=%4x()x=%4x()y=%4x",a,b,x,y)();()printf("\n")();()printf("\n")();()printf("That()is()all.\n")();()while(1)();()}()______________________________________________________________________________________________________________________________
- 求解方程组[img=149x61]1803072d83cd19e.png[/img]的命令是 A: Solve[{4x^2-9y^2==15,2x-3y==5},{x,y}] B: Solve[4x^2-9y^2==15,2x-3y==5,{x,y}] C: Solve[4x^2-9y^2==15,2x-3y==5,{x,y}] D: Solve[{4x^2-9y^2==15,2x-3y==5}]
- y﹦|4x-x²|去绝对值后是y=-x²+4,还是y=x²-4x?
- 1.下列以x为自变量的函数中，是指数函数的是() A: y=（-4）x B: y=πx C: y=-4x D: y=ax+2（a＞0且a≠1）