3分之2x+4分之一y=2 3分之1x+8分之1y=12分之7
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1/(x-1)+2/(6y-3)=1所以1/(x-1)+2/[3(2y-1)]=11/(2x-2)-1/(2y-1)=0所以1/[2(x-1)]-1/(2y-1)=0令a=1/(x-1),b=1/(2
x=y+3∴x-y=34分之一(x-y)的平方-0.3(x-y)+0.75(x-y)的平方+10分之3(x-y)-2(x-y)+7=(0.25+0.75)(x-y)²+(-0.3+0.3-2
这个比较简单了:由已知条件得:x+y=3xy那么:x-2xy+y=3xy-2xy=xy2x+3xy+2y=6xy+3xy=9xy所以答案是:9再问:x分之一+y分之一=3为什么等于x+y=3xy再答:
根号下大于等于0所以3x-2>=0,x>=2/32-3x>=0,x
1/x+1/y=-1/21/x*1/y=1所以由韦达定理1/x,1/y是方程x²+x/2+1=0的根判别式小于0所以无解再问:x分之一加y分之一=1,x乘y分之1=负2分之求x、y,谢谢,感
1/x--1/y=3,化简y--x=3xy(2x-3xy-2y)/(x-2xy-y)=[-2(y-x)-3xy]/(x-y-2xy)=-9xy/-5xy=9/5
1、两边乘以(y-1)得-3=y-5∴y=2经检验:y=2是方程的解∴方程的解是y=22、两边乘以x(x+1)(x-1)x-1+3(x+1)=6xx-1+3x+3=6x-2x=-2∴x=1经检验:x=
-0.5再问:算式再答:
t/2-6×t/3+3/4=03t/2=3/4t=1/2
|x-1|+|y+3|=0|x-1|≥0|y+3|≥0所以x-1=0,y+3=0x=1,y=-3原式=1/1*-3+1/3*-1+1/1*5+1/3*7+1/5*9+.+1/(2n-1)(2n+3)=
x/2-y/4=12①x/3+y/2=10②①×4+②×22x+2x/3=68两侧乘以36x+2x=204x=51/2代回①51/4+y/4=12两侧乘以451+y=48y=3所以x=51/2y=3
2X-3Y=48,那就多了,答案很多,自己选
1/x-1/y=3(y-x))/xy=3所以x-y=-3xy原式=[2(x-y)+3xu]/[(x-y)-2xy]=[2(-3xy)+3xu]/[(-3xy)-2xy]=-3xy/(-5xy)=3/5
x-(x+y)+(x+2Y)-(x+3y)+(x+4y)...-(x+2009y)=-y+2y-3y+4y+...-2007y+2008y-2009y=1004y-2009y=-1005y=-1005
1/x-1/y=3x-y=-3xy(2x+3xy-2y)/(x-2xy-y)=[2(x-y)+3xy]/[(x-y)-2xy]=(-3xy)/(-5xy)=3/5
再答:望采纳
x=4/3y=6/5
(x^2+1/2xy+1/2y^2)-(x^2+3/2xy-2y^2)=x^2+1/2xy+1/2y^2-x^2-3/2xy+2y^2=-xy+5/2y^2=-(-1/4)×1/2+5/2×(1/2)
若规定1/2&3=1/2×2/3×3/4,1/7&4=1/7×2/8×3/9×4/10,求1/2&4+1/5&3原式=1/2×2/3×3/4*4/5+1/5*2/6*3/7=1/5+1/35=8/35