3x+2y=6 4x-2y=8 谁教教~

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