3x+2y=6 4x-2y=8 谁教教~
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3x+2y=6 4x-2y=8 谁教教~
因式分解、谁来教教我这些题啊?1、(1+2ab)²-(2+2ab)²2、(7x+y)(7x-y)-(-x+y)(x-y)3、(x-2y-1)(x+2y-1)4、(a-b-2c)²5、(x+2y-3/2)(x-2y+3/2)6、已知,2x-y=1/3,xy=2,求2x^4y³-x³y^4的值.
(x-6)(y+12)=(x+4)(y-4)=xy 谁来教教我?
、问题是这样的 x²+y²+z²-2x+4y-6y+14=0,求x+y+z的值谁来教教
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^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+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
一道方程解答,望高手教教我如果3x=2-4y,那么y=( )(用含x的式子表示y),( )
若X/10=Y/11=Z/12(x≠0),则(3X+2Y-4Z)/(5X-6Y)=?请各位大哥大姐教教我啊
{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) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
3(2X+Y)+(2(2x-Y)=6 (8X+4y)-(10X-5Y)=2
解方程组 x-y/3-x+y/4=2 x-y/6-x+y/8=3
解方程组8/(x+y) +(x-y)/2=3,6/(x+y)-(x-y)/4=1