已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)的平方的值
x(x+y)(x-y)-x(x+y)^2 =x(x+y)(x-y-x-y)=x*1*(-2y)=-2xy =-1
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)² x(x+y)(x-y)-x(x+y)² =x(x+y)[(x-y)-(x+y)] =x(x+y)(x-y-x-y) =-2xy(x+y) =-2×(-1\/2)×1 =1 已知集合A={(x,y)丨y=x2-1,x∈R},B={(x,y)丨y=-x2+7,x...
已知x+y=1,xy=负二分之一,求x(x+y)(x-y)-x(x+y)的二次方的值
x(x+y)(x-y)-x(x+y)的二次方 =x(x+y)(x-y-x-y)=-2xy(x+y);=-2×(-1\/2)×1 =1;如果本题有什么不明白可以追问,如果满意记得采纳 如果有其他问题请采纳本题后另发点击向我求助,答题不易,请谅解,谢谢。祝学习进步
已知x+y=1,,xy=-二分之一,利用因式分解求 x(x+y)(x-y)-x(x+y)平方
解 x(x+y)(x-y)-x(x+y)平方 =x(x+y)[(x-y)-(x+y)]=x(x+y)(-2y)=-2xy(x+y)=-2×(-1\/2)×1 =1 记得采纳
x+y=1,xy=-1\/2,求x(x+y)(x-y)-x(x+y)2
解:原式=x(x+y)(x-y-x-y)=-2xy(x+y)=-1
已知:x+y=1,xy=-2分之一,利用因式分解求x乘括号x加y乘括号x减y减x乘...
x(x+y)(x-y)-x(x+y)^2 =x(x+y)(x-y-x-y)=-2xy(x+y)=-2*(-1\/2)*1 =1
已知x+y=1,xy=-1\/2,利用因式分解求x(x+y)-x(x+y)的平方的值?
当x+y=1,xy=1 2 时,原式=-2×(-1 2 )×1=1.,1,因为x+y=1\/2,xy=1 解不出x y 题目又没出错 题目写清楚点 由你说的x+y=二分之一,xy=1,得到X^2+Y^2=--3\/4,而这是不可能的,1,已知x+y=1,xy=-1\/2,利用因式分解求x(x+y)-x(x+y)的平方的值 因式分解(a的...
已知x+y=1,xy=-1\/2,利用因式分解求x(x+y)-x(x+y)的平方的值_百度...
x*(x+y)-{ x* (x+y) }* {x *(x+y) } = x*1-x*x =x*(1-x)=x*(x+y-x)=x*y =-1\/2
将x(x+y)(x-y)-x(x+y)的平方分解因式,并求当x+y=1,xy=-二分之一时的...
回答:x(x+y)(x-y)-x(x+y)的平方 =x(x+y)[(x-y)-(x+y)] =-2xy(x+y) =-2×(-1\/2)×1 =1
【初二数学】已知:X+Y=1,XY=-½。利用因式分解法求:X(X+Y)(X—Y...
解:x(x+y)(x-y)-x(X+Y)²=(x+y)(x²-xy-x²-xy)=(x+y)(-2xy)=1x(-2)x(-½)=1