{x/4-y/5=1 4x=5y=7} 【二元一次方程,
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{x/4-y/5=14x=5y=7}【二元一次方程,{x/4-y/5=14x=5y=7}【二元一次方程,{x/4-y/5=14x=5y=7}【二元一次方程,你的方程貌似写错了~x/4-y/5=15x-
{x/4-y/5=1 4x=5y=7} 【二元一次方程,
{x/4-y/5=1 4x=5y=7} 【二元一次方程,
{x/4-y/5=1 4x=5y=7} 【二元一次方程,
你的方程貌似写错了~
x/4-y/5=1 5x-4y=20 25x-20y=100 .1
4x-5y=7 4x-5y=7 16x-20y=28 .2
1式加2式,得:
41x=128
x=128/41
y=(4*128/41-7)/5
5x-4y(y-x)=?
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x
x+y/y=5/4,则x/y=----------------
已知:4x = 5y,求(x+y) :y
x*x+2x+y*y-4y+5=0 x= y=
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知(3x+1)(3x-3)-3x+2)^2=-7,(y+7)(y-7)-y(y-7)=0,求8y^2-5y(-y+3x)+4y(-4y-5/2x)的值
化简求值(x+5y)(x+4y)-(x-y)(x+y),其中x=一又2/5,y=-1/7
(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy,其中x=2011,y=-1,
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=