sketch the region in the plane consisting of all points(x,y) such that |x|+|y|≤1
问题描述:
sketch the region in the plane consisting of all points(x,y) such that |x|+|y|≤1
就是|x|+|y|≤1用图像法怎么表示,告诉我经过横纵坐标轴的那个点和描法就行.
答
这个图像应该是由4条线段和坐标轴围成的一个实心的正方形先在第一象限里面做出x+y=1来(取点(1,0)(0,1)直线x+y=1和坐标轴围成1个等腰直角三角形然后这个图像沿着Y轴对折做出跟Y轴对称的第二象限的图像.再做出跟X...