3X+5/5=2X-1/3 3Y-1/4-1=5Y-7/63X+5/5=2X-1/33Y-1/4-1=5Y-7/6
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3X+5/5=2X-1/3 3Y-1/4-1=5Y-7/63X+5/5=2X-1/33Y-1/4-1=5Y-7/6
3X+5/5=2X-1/3 3Y-1/4-1=5Y-7/6
3X+5/5=2X-1/3
3Y-1/4-1=5Y-7/6
3X+5/5=2X-1/3 3Y-1/4-1=5Y-7/63X+5/5=2X-1/33Y-1/4-1=5Y-7/6
两边乘15
3(3x+5)=5(2x-1)
9x+15=10x-5
x=20
两边乘12
3(3y-1)-12=2(5y-7)
9y-3-12=10y-14
10y-9y=-3-12+14
y=-1
把括号打出来嘛 有点不理解你那是 (3x+5)/5还是 3x+5/5……后面的也是 有括号和没括号结果不一样……
如果都没得括号 答案就是:x=-4/3 y=-1/24
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
{x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
3x-2y=1 4x-5y
化简求值{(x=2y)(5x-2y)-(3x+2y)(3x-2y)]/4x,其中x=2,y=-1
(x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2
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
解下列方程组:{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
4(x+2)=1-5y 4(x+y)-3(x-y)=12
4x-3y=5 x^2+y^2=1 求x,y
{(x+y)/2=(3x+4y)/5,(x+y)/2=1,
3x+4y-5=0 x^2+y^2=1求x.y
3x+2y/4=2x+y/5=x-y+1/6
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
3x-y+x=3 4【X-y-1】=3【1-y】-1 5x-4y+4x=3 2x+y-3x=11 【 x除以2 】-【y 除以3】 =2 2x+7y-3x=19 x+y+x=12 3x+2y-x=18
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(x+2009y)的值.