若(5X+2Y-12)(5X+2Y-12)+|3x+2y-6|=0,则2x+4y=?

若|x-2y+6|+(x+y+12)的2次方,求4x+5y 若x-2y=5,则式子12-x+2y=.以知3x-4y=2x+y则x∶y= 解方程组 2x-y=5 2y/x-x/y=12x-y=52y/x-x/y=1 化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90) 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 2x+4y-5x-y+12-11frgbnihai 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 5/12[-3/4(x-y)^3]*(x+y)^2*(-x-y)^3*5/6(y-x)^2 解方程组：x+y/2+x-y/3=6 4(x+y)-5(x-y)=12 2(x-2y)²-7(x-2y)³+3(2y-x)²+(2y-x)³合并同类项 这个式子2（x-2y)²-7（x-2y)³+3(2y-x)²-(2y-x)³=2（x-2y)²-7（x-2y)³+3(x-2y)²+(x-2y)³=5(x-2y)²-6(x-2y)³=(x-2y)²(5-6x+12y) 3x—y=5 ,5x+2y=12 ,x=?y=? 4(x+2)=1-5y 4(x+y)-3(x-y)=12 {x+y+z=12 x+2y+5z=22 x=4y 6x^4y^3+12x^3y^4-24x^2y^5因式分解 5x(x-y)+2y(x-y) 化简:5(x-y)+2(x+y)-3(x-y) (1)x^2*x^8+x^13/x^3 (2)a^19/a^12/a^3 (3) (x-2y)^5/(2y-x)^3 (4)(x-y)^5/(x-y) (5)(x-y)^6/(y-x)^4 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)