计算下列分段函数。
f(x,y)= 2x2+3x+1/(x+y ) (x>=0,y>0)
f(x,y)=2x2+3x+1/(1+y2 ) (x>=0,y<=0)
f(x,y)=3sin(x+y)/ (2x2+3x+1 ) (x<0)
具体要求如下:
(1) 用if语句实现多路分支,自变量x,y与函数值均用双精度类型。
(2) 自变量x,y用scanf函数输入,且输入前要有提示。结果的输出采用以下形式:
x=具体值,y=具体值,f(x)=具体值
(3) 分别输入x=3,y=8;x=5,y=-9;x=-7,y=2运行该程序。
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