4分之3y减1等于6分之5y减7-搜答案-拍题作业网

y减去2又2分之一等于5分之y减1,减3分之yy-2.5=(y-1)/5-y/3两边同乘以30得：30y-75=6y-6-10y34y=69y=69/34y=2又1/34

1/(x-y)=5x-y=1/5x/y=6则x=6y所以x-y=6y-y=1/5y=1/25,x=6/25所以原式=1/(36/625+1/625)=625/37

解得m=1/3=1/x那么x=3n=1=1/y那么y=1再问：谢谢。可不可以给我你的QQ我还想问几道题

3分之x减6分之y减11等于52（y减2分之x）=3（y+18分之x）整理得：y=2x-189①x+3y=0②①代人②得：x+6x-567=07x=567∴x=81y=-27

33/56

x/2=y/3=z/4=tx=2ty=3tz=4tx+y-z=1/122t+3t-4t=t=1/12x=1/6y=1/4z=1/3xyz=1/6*1/4/*1/3=1/72

1/x-1/y=4(y-x)/xy=4x-y=-4xy(3X+5xy-3y)/(x-3xy-y)=[3(x-y)+5xy]/[(x-y)-3xy]=(-12xy+5xy)/(-4xy-3xy)=1

后半句意思都没表达清楚求采纳

解析：

(3x+2y)/4=(2x+y)/5(3x+2y)/4=(x-y+1)/6去分母化简得到：5（3x+2y）=4(2x+y)6(3x+2y)=4(x-y+1)去括号移向化简得7x=-6yx=2/7-8y

3x/4+2y=(2x+y)/5=(x-y+1)/6则3x/4+2y=(2x+y)/5―→15x+40y=8x+4y→7x+36y=0――①(2x+y)/5=(x-y+1)/6―→12x+6y再问：麻

x+2y=(y-x)/4x+2y=(2y-1)/3化简此二元一次方程组5x+7y=0→15x+21y=0……………………①3x+4y=-1→15x+20y=-5…………………②解此二元一次方程组①-②

x=1/5y=1/7(1/x+1/y)/(1/x-1/y)=(5+7)/(5-7)=12/(-2)=6

x/3=y/4=z/5x=3/4y,z=5/4y(x+y-z)/(x-y+z)=(3/4y+y-5/4y)/(3/4y-y+5/4y)=1/2y/y=1/2

y分之x减y=x/y-1=3/4-1=-1/4有什么不明白可以对该题继续追问请及时选为满意答案,

1/x-1/y=3y-x=3xyx-y=-3xy(5x-xy-5y)/(x-xy-y)=(-15xy-xy)/(-3xy-xy)=4

负5分之2(3y+2)等于10分之1减2分之3(y-1)-2/5(3y+2)=1/10-3/2(y-1)方程两边乘以10-4（3y+2)=10-15(y-1)-12y-8=10-15y+15-12y+

3/4x=y/5,则x:y=4:15,y/5=z/6,则y:z=5:6,所以:x:y:z=4:15:18

u+v=3,u-v=-1u=1,v=2x=5.5,y=4.5

很复杂的表达,我猜是这样的算式吗? (x+)/0.2-(x-3)/0.5=-1.6 即5(x+1)-2(x-3)=-1.6 即3x+11=-1.6