若丨x丨=7,丨4丨=4,且x

若丨x丨=7,丨4丨=4,且x 丨x丨=7,丨y丨=4,且丨x+y丨=x+y试求x-y的值 若丨x丨=4,丨y丨=二分之一,且xy 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 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x 集合A=｛X丨0≤X＜3且X属于N｝的真子集的个数是?A.16 B.8 C.7 D.4 若丨x丨=5,丨y丨=2,且x>y>0,求x十y的值 若丨x丨=-3,且xy=-12,则x-y的值等于 已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y 求f(x)=(x-2)/(x²-4x+5),且x 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=2,丨y丨=3,丨z丨=4,且x>y>z,求x+y+z的值. 若丨x丨=3,丨y丨=2,且丨x-y丨=y-x,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 若函数y=f（x）的定义域为{x丨-3≤x≤6且x≠4},值域为{y丨-2≤y≤4,且y≠0},试做出该函数图象 若函数y=f（x）的定义域为{x丨-3≤x≤6且x≠4},值域为{y丨-2≤y≤4,且y≠0},试做出该函数图象