作业帮x+y-1>=0,x-y+1>=0,4x+y-2>=0.实数x,y满足约束条件,求x-y/x+y取值范围
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x+y-1>=0,x-y+1>=0,4x+y-2>=0.实数x,y满足约束条件,求x-y/x+y取值范围
x+y-1>=0,x-y+1>=0,4x+y-2>=0.实数x,y满足约束条件,求x-y/x+y取值范围
x+y-1>=0,x-y+1>=0,4x+y-2>=0.实数x,y满足约束条件,求x-y/x+y取值范围
令a=x-y,b=x+y,然后x=（a+b)/2,y=(b-a)/2,代到原来三个式子里去.b-1>=0,a+1>=0,3a+5b>4,要求的就是a/b的取值范围.做一个直角坐标系,横轴b,纵轴a,然后根据那三个不等式做出a和b的取值区域.令k=a/b,作直线a=kb,a和b必须要得到的取值区域内,接下来你应该会了吧.
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解下列方程组：{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0