已知丨x丨=3,丨y丨=5,且x

若丨x丨=3,丨y丨=5,且丨x+y丨=(x+y),则x-y的值为 ,已知x 已知丨x丨=3,丨y丨=5,且x 已知丨x丨等于5,丨y丨=8,且丨x-y丨=y-x,求x+y的值 已知丨X丨=2、丨y丨=3,且X 已知x、y满足约束条件X+Y》0且x-y+5≥0且X《3,则Z=丨4x-y丨的最大值是?最好有图! 已知丨x丨=7丨y丨=2且丨x+y丨=-(x+y)求x-y的值 已知丨x丨=5,丨y丨=2.且丨x+y丨=x+y,求xy值 已知丨x丨=7,丨y丨=2,且x 已知x,y是有理数,且满足丨3-x丨+丨y-15丨=0求3x+2y的值. 已知有理数x,y,且丨x-3丨+7(2y+1)²=0,求x+2y的值. 若丨x丨=3,丨y丨=5,且丨x-y丨=-(x-y).求丨x-3丨+(y-5)²的值 丨x丨=3,丨y丨=5,且丨x+y丨=-x-y,求x-y的值 若丨x丨=3,丨y丨=5,且丨X+Y丨=－X－Y,求X－Y的值 已知丨x丨=3,(y+1)^2=4,且xy 已知丨x-1丨=2,(y+3)^2=9,且xy 已知丨x丨=3,(y+1)=4,且xy 已知丨3x+y-5丨+丨x-2y-4丨=0 求x,y的值 丨-x丨=丨-2丨,求x的值.已知丨y+1丨=-(-5),求y值.若丨x+1丨=丨-4丨,且x＜0,求x值丨-x丨=丨-2丨,求x的值已知丨y+1丨=-(-5),求y值若丨x+1丨=丨-4丨,且x＜0,求x值已知丨x丨=5,丨y丨=2,且丨x+y丨=x+y,求xy值已知