x减y等于5O,×除以y等于3,x是多少,y是多少
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x/(y-x)
y=(5x+6)/(3x+4)=(5x+6)/3(x+4/3)=(5x+20/3-2/3)/3(x+4/3)=(5x+20/3)/3(x+4/3)-(2/3)/3(x+4/3)=5(x+4/3)/3(
根据题意知:X/3=Y/4=Z/5设X/3=Y/4=Z/5=K则X=3K,Y=4K,Z=5K所以(X+Y)/(X-2Y+3Z)=(3K+4K)/(3K-2*4K+3*5K)=7K/(10K)=7/10
3X+XY-3Y/(X-XY-Y)?由1/X-1/Y=3得y-x=3xyx-y=-3xy则3X+XY-3Y/X-XY-Y化简为3(x-y)+xy/(x-y-xy)=3(-3xy)+xy/(-3xy-x
由(2x-y)/(x+3y)=3(4x-2y)/(x+3y)-(4x+12y)/(2x-y)=2(2x-y)/(x+3y)-4(x+3y)/(2x-y)=2×3-4×1/3=14/3
(Y-3000)/3=y/3-3000/3'=y/3-1000望采纳,谢谢^_^如还有问题,可以问我
原题:x,y,z满足等式(3x+4y)/2=(6x+5y)/3=(4x-y+13z)/2,那么(x+2y+z)/(2x+3y-z)的值是多少由(3x+4y)/2=(6x+5y)/3求得y=3/2x=1
x、y互为倒数,则x与y有三个情况.1.当x>0时如:x=2,则y=1/2,所以x÷y=2÷(1/2)=4,所以x÷y=x²2.当x=0时则x÷y=0÷0=0,故没有意义,所以舍去3.当x<
是1/x+1/y=5么?题不对吧
Y等于(565-19)÷(27-1)=21X等于565+21=586
1/x-1/y=3通分(y-x)/xy=3y-x=3xyx-y=-3xy原式=[(x-y)-xy]÷[5(x-t)+xy]=(-3xy-xy)/(-15xy+xy)=-4xy/(-14xy)=2/7
X比y3:2=300:200所以y=200因为5z=300z=60则X=180Y=120所以X-Y=180-120=60
xy(1/x-1/y)=5xyy-x=5xyx-y=-5xy原分式=3(x-y)+5xy/(x-y)-3xy=-10xy/-8xy=5/4
等会再答:x=24/7y=24/5z=24再问:请告诉我过程。再答:过程就是,按题目列等式,然后等式两边同取倒数,左边把它分解成分式。列出三个方程,组成三元一次方程组解得。再问:不明白,麻烦你写一下。
X+y=55X-y=13X=3y=5再答:点错了y=2
(5y+1)÷6=(9y+1)÷8-(1-y)÷3[(5y+1)÷6]×24=[(9y+1)÷8-(1-y)÷3]×244×(5y+1)=3×(9y+1)-8×(1-y)20y+4=27y+3-8+8
3x除以4等于2y除以5两边乘以4/3左边=x右边=y*2/5*4/3=y*8/15所以x除以y等于8除以15
x/y=8x-y=714联立,解得x=816,y=102