若|x-y 2|与x y−1互为相反数,则x=_____,y=_____.
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/08 02:46:18
因为绝对值和平方是非负数大于等于0而两个非负数互为相反数说明这两个都为0.所以x-y+1=0xy+1=0x-y=-1xy=-1那么原式=-1^2除以0除以1+1不能除以0所以(x-y)^2/2xy-2
根据题意可知:√(3x-2y-1)≥0,√(2x+y-3)≥0,已知√(3x-2y-1)与√(2x+y-3)互为相反数,两个非负数互为相反数,这只有一种可能:这两个非负数都为0,实数中只有0的相反数还
(1+x)*(1+y)=11+xy+x+y=1xy+x+y=0xy=-(x+y)-------------A式由于1/x-1/y=(y-x)/(xy)试问题目是否出错,是否应改为1/x+1/y的结果:
(1+x)(1-y)=11-y+x-xy=1x-y-xy=0,两边同时除以xy,1/y-1/x-1=01/x-1/y=-1
因为绝对值和根号下的数都是非负数,所以根据题意得到:5-x-y=03x-2y+1=0解方程得到:x=9/5y=16/5根号下xy=12/5
已知│x-y+1│与x2+8x+16互为相反数,求x2+2xy+y2的值.x-y+1=0;(1)(x+4)=0;x=-4;y=-4+1=-3;∴x2+2xy+y2=(x+y)²=(-4-3)
∵|x-y+1|与x2+8x+16互为相反数,∴|x-y+1|与(x+4)2互为相反数,即|x-y+1|+(x+4)2=0,∴x-y+1=0,x+4=0,解得x=-4,y=-3.当x=-4,y=-3时
x-2=02y+1=0x=2,y=-1/2xy=-1
∵x<y<0,∴x-y<0,x+y<0.∴x2−2xy+y2=(x−y)2=|x-y|=y-x.x2+2xy+y2=(x+y)2=|x+y|=-x-y.∴x2−2xy+y2+x2+2xy+y2=-2x
∵|3-x|与|x+y|互为相反数∴|3-x|+|x+y|=0∵|3-x|≥0,|x+y|≥0∴3-x=0x+y=0解得:x=3,y=-3∴(x-y)/xy=【3-(-3)】/3x(-3)=-2/3
∵|x-y+2|与|x+y-1|为相反数∴x-y+2=x+y-1=0∴x=-1/2y=3/2∴xy=-3/4∴xy负倒数为4/3
-1.1+x与1+y互为倒数,则(1+x)(1+y)=11+x+y+xy=1x+y+xy=0x+y/xy=-11/x+1/y=(x+y)/xy=-1
1+x=1/(1+y);1+x+y+xy=1;x+y+xy=0;x+y=-xy;1/x+1/y=(x+y)/(xy)=-1;
AB互为相反数,那么A+B=0XY互为倒数,那么XY+1XY-A-B=XY-(A+B)=1-0=1
|x+y-1|+|x+2|=0x+y-1=0,x+2=0x=-2,y=3ab=1所以xy+ab=-6+1=-5
∵x2-4x+4与|y-1|互为相反数,∴x2-4x+4+|y-1|=0.∴(x-2)2+|y-1|=0.∴(x-2)2=0,|y-1|=0.∴x=2,y=1.∴(xy−yx)÷(x+y)=(2-12
49(x-2y-5)*2
(1)|x-y+1|≥0,x^2+8x+16=(x+4)^2≥0两者互为相反数,所以|x-y+1|=x^2+8x+16=0x-y+1=0,x+4=0,所以x=-4,y=-3x2+2xy+y2=(x+y
(x-3)+/y+1/=0有题可知x-3=0,/y+1/=0则x=0+3=3,y=0-1=-1所以xy=3*(-1)=-3