梯形面积
牛牛学梯形
http://www.nowcoder.com/questionTerminal/b99fa8962ad643baa3cbc17b860f262c
include<stdio.h>
main()
{int up,down,height;
double s;
scanf("%d%d%d",&up,&down,&height);
s=(double)(up+down)*height/2;
printf("%.3f",s);}
牛牛学梯形
http://www.nowcoder.com/questionTerminal/b99fa8962ad643baa3cbc17b860f262c
main()
{int up,down,height;
double s;
scanf("%d%d%d",&up,&down,&height);
s=(double)(up+down)*height/2;
printf("%.3f",s);}
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