<pre class=\"replyask-text\" id=\"content-2052519\">#includestdio.h
void main()
{ float x1,x2,x3,y1,y2,y3,k;
scanf(\"%f%f%f%f%f%f\",
if(x1!=x2)
k=(y1-y2)/(x1-x2);
else
k=0;
printf(\"%f\\n\",k);
if((y3-y1)==k*(x3-x1))
printf(\"在一条直线上\\n\");
else
printf(\"不在一条直线上\\n\");
} |
