若x减3的差的平方加y加1的绝对值加z的平方等于0 求2分之1
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y=根号(x-3)+根号(3-x)-5要使根号下的数有意义,必有:x-3=3-x=0x=3y=-5x的平方减2xy加y的平方=(x-y)²=(3+5)²=64
2y-x=5所以x-2y=-5所以原式=(-5)²-3×5+60=25-15+60=70
|x-2|+[y-(2/3)]^3=0问y^2=?
(√(x-3y)+|x^2-9|)/(x+3)^2=0应该是这个式子吧(x+3)^2不可等于0所以x不等于-3将(x+3)^2乘向右边√(x-3y)+|x^2-9|=0因为√(x-3y)>=0|x^2
(x加y加z)的二次方减(x加y加z)的二次方=(x+y+z+x+y+z)(x+y+z-x-y-z)=0你抄错了吧再问:再答:(x加y加z)的二次方减(x加y-z)的二次方=(x+y+z+x+y-z)
x2+xy-2y2=0(x-y)(x+2y)=0x-y=0,x+2y=0x=y或x=-2yx=y,则原式=(y2+3y2+y2)/(y2+y2)=5y2/2y2=5/2x=-2y,则原式=(4y2-6
再问:我想要过程耶,,,再答:
0<y<x【(x^2+y^2)(x-y)】-【(x^2-y^2)(x+y)】=【(x^2+y^2)(x-y)】-【(x-y)(x+y)^2】=(x-y)【(x^2+y^2-(x+y)^2】=(x-y)
((x-y)(x+y))^2=(x^2-y^2)^2=16,平方差公式
x^2+2xy+y^2=25===>(x+y)^2=5^2===>x+y=±5(x-y)^2-3x+3y+2=0===>(x-y)^2-3(x-y)+2=0===>[(x-y)-1]*[(x-y)-2
x-y的平方加x+y的平方的和乘以x的平方减y的平方的差=(x²+y²-2xy+x²+y²+2xy)x(x²-y²)=2(x²+y
x²+y²=x²+2xy+y²-2xy=(x+y)²-2xy=3²-2×1=7
x²+y²=x²-xy+y²+xy=3+5=82x²+xy+3y²=2x²-2xy+3y²+3xy=2(x²-
x^2-y^2-x+y=(x-y)A(x-y)(x+y)-(x-y)=(x-y)A(x-y)(x+y-1)=(x-y)A(x-y)(x+y-1)-(x-y)A=0(x-y)(x+y-1-A)=0(x-
x+y+1=0x+y=-1(x加y)的平方减3(x加y)a=1+3a=7a=2a的平方加2=6
根号(2x+1)+(y-2)=0那么2x+1=0x=-1/2y-2=0y=2x^y+xy=-3/4
平方数和绝对值都>=0,如果其和为0,则每项皆为0.因此,有(x-3)^2=0,x=3|y-1|=0,y=1z^2=0,z=0所以,1/2{(X-Y)的平方加(Y-Z)的平方加(Z-X)的平方}=1/
(x-3)²+|y-1|+z²=0平方数和绝对值永远大于等于0(x-3)²=0,|y-1|=0,z²=0x=3,y=1,z=0(x-y)²+(y-z)
2x的平方+ax-y+6-2bx的平方+3x+5y+1的值与字母x的值无关,所以2x的平方+ax-2bx的平方+3x=0a=-2b=3/2带入求值就好