3x+2y/4=2x+y+2/5=4x+5y/3(3x+2y)/4=(2x+y+2)/5=(4x+5y)/3

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3x+2y/4=2x+y+2/5=4x+5y/3(3x+2y)/4=(2x+y+2)/5=(4x+5y)/33x+2y/4=2x+y+2/5=4x+5y/3(3x+2y)/4=(2x+y+2)/5=(

3x+2y/4=2x+y+2/5=4x+5y/3(3x+2y)/4=(2x+y+2)/5=(4x+5y)/3
3x+2y/4=2x+y+2/5=4x+5y/3
(3x+2y)/4=(2x+y+2)/5=(4x+5y)/3

3x+2y/4=2x+y+2/5=4x+5y/3(3x+2y)/4=(2x+y+2)/5=(4x+5y)/3
可以分成(3x+2y)/4=(2x+y+2)/5和(2x+y+2)/5=(4x+5y)/3
对角相乘
(3x+2y)/4=(2x+y+2)/5
5(3x+2y)=4(2x+y+2)
15x+10y=8x+4y+8
7x+6y=8 (1)
(2x+y+2)/5=(4x+5y)/3
3(2x+y+2)=5(4x+5y)
6x+3y+6=20x+25y
14x+22y=6
7x+11y=3 (2)
(2)-(1)
5y=-5
y=-1
代入(2),7x-11=3
x=2

你的表达有问题的，/4，/5/3是放在哪里的，只要把两个等式求出一个未知数的等式多少X等于多少Y，然后带入另一个公式就可以知道了啊，这个很简单的

3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 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 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 3X=5Y （X+Y)*3X=(2Y+X)*4+2*2 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x*x+2x+y*y-4y+5=0 x= y= 2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)