3Y分之X与2Y平方分之3X
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/28 00:57:57
(x-y)分之(x²+y²)+(y-x)分之(2x-y),其中x=3+√2,y=3-√2=(x²+y²)/(x-y)-(2x-y)/(x-y)=(x²
3x^2+xy-2y^2=(3x-2y)(x+y)=0x=-2y/3,或x=-y但由于你要求的式子中分母里有X平方-Y平方x=-y舍去其他就代入吧
【x-y-(x-y分之4y平方)】【x+y-(x+y分之4x平方)】除以【3(x+y)-x-y分之8xy】=(x-y-x+4y)(x+y-x-4x/y)/(3x+3y-x-8x)=3y*(y-4x/y
x/y=7/2(x²-3xy+2y²)/(x²+2xy+y²)=[(x/y)²-3(x/y)+2]/[(x/y)²+2(x/y)+1]=[(
若是:①4x²-y²和②X/(3Y-6X),则公分母是3(y-6x);若是:①1/(4x²-y²)和②X/(3Y-6X),①=1/[(2x-y)(2x+y)],
y=2x/3则xy=2x2/3y2=4x2/9所以原式=(2x2/3)/(x2+4x2/9)-(4x2/9)/(x2-4x2/9)=(2/3)/(1+4/9)-(4/9)/(1-4/9)=6/13+4
如果问题写清楚一些就好啦
(1)y=x-3分之2x+1y=(2x+1)/(x-3)=(2x-6+7)/(x-3)=2+7/(x-3)∴值域是{y|y≠2}(2)1+x的平方分之1-x的平方y=(1-x²)/(1+x&
x/(3y)的分母是3y3x/(2y²)的分母是2y²两个分式的最简公分母是6y²,通分:x/(3y)=x×2y/(3y×2y)=2xy/(6y²)3x/(2y
3y与2y²的最简公分母是6y²3y分之x=x/(3y)=(2y×x)/(2y×3y)=(2xy)/(6y²)2y平方分之3x=3x/(2y²)=(3×3x)/
再答:不明白的地方可以追问,望采纳,谢谢
解(1):最简公分母是6(x+5)3分之x=x/3=2x(x+5)/[6(x+5)]6分之1-x=(1-x)/6=(1-x)(x+5)/[6(x+5)]x+5分之x平方-x=(x²-x)/(
[1]y+2分之y的平方-6y+9除以[3-y]=(3-y)²/(y+2)×/(3-y)=(3-y)/(y+2)[2]x的立方分之x的平方y乘以[-y分之1]=x²y/x³
平方差=[(3x-2y)/2+(3x+2y)/2][(3x-2y)/2-(3x+2y)/2]=[(3x-2y+3x+2y)/2][(3x-2y-3x-2y)/2]=3x*(-2y)=-6xy
再问:x-x的平方分之x的平方-1×1-y分之xy-x(这题呢?帮个忙啦亲~~)再答:望采纳,谢谢。
还有下面这种方法7x平方-y平方分之x平方-2xy+3y平方分子分母同时除以y²=[(x/y)²-2(x/y)+3]/[7(x/y)²-1]=(4/9-4/3+3)/(2
(x+y)/(x-y)=3/2[(x/y)+1]/[(x/y)-1]=3/23(x/y)-3=2(x/y)+2x/y=5y/x=1/5(x^2+y^2)/xy=x/y+y/x=5+1/5=26/5
(3x分之y)的平方×(-y分之x)的三次方÷(-x分之2y)方=(y²/9x²)(-x³/y³)(x²/4y²)=-x³/36y