(3x+2y)/4=(2x+y+2)/5=-(x+5y)/3
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(3x+2y)/4=(2x+y+2)/5=-(x+5y)/3(3x+2y)/4=(2x+y+2)/5=-(x+5y)/3(3x+2y)/4=(2x+y+2)/5=-(x+5y)/3(3x+2y)/4=
(3x+2y)/4=(2x+y+2)/5=-(x+5y)/3
(3x+2y)/4=(2x+y+2)/5=-(x+5y)/3
(3x+2y)/4=(2x+y+2)/5=-(x+5y)/3
(3x+2y)/4=(2x+y+2)/5=-(x+5y)/3
分解成两个方程
(3x+2y)/4=(2x+y+2)/5…………(1)
(3x+2y)/4=-(x+5y)/3…………(2)
整理(1),得:
5(3x+2y)=4(2x+y+2)
15x+10y=8x+4y+8
7x+6y=8…………(3)
整理(2),得:
3(3x+2y)=-4(x+5y)
9x+6y=-4x-20y
13x=-26y
x=-2y…………(4)
把(4)代入(3),得:
7*(-2y)+6y=8
-14y+6y=8
-8y=8
y=-1
代入(4),得:
x=-2*(-1)=2
方程组的解为:
x=2
y=-1
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
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
3X=5Y (X+Y)*3X=(2Y+X)*4+2*2
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
(2x-y)(3x-4y)-2(x-y)(2x-5y)简便运算
5/4(x+y)(-x-y)^3*[-4/3(x-y)]*[-3/5(y-x)^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
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
5x^3y(x-y)^3-10x^4y^3(y-x)^2因式分解