若|3x+2y-4|与6(5x+7y-3）的平方互为相反数,则x与y的值是（ ） A.方程组x=1,y= -1 B.x=2,y= -1 C.不存在

若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 (3x-4y)(5x-4y)-(7x-8y)(6y-5x) 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 若|3x+2y-4|与6（5x+7y-3）的平方互为相反数,则x y的值是 A X=1 Y=1 B x=2 y=-1 C不存在 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) 把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²= 5x-6y= -28 ,3x+4y=6求x与y 把(x-y)看作一个整体,化简:(1)5(x-y)+2(x-y)-4(x-y);(2)3(x-y²-4(x-y)+7（x-y)-6(x-y) 把(x-y)看做一个整体,合并同类项5(x-y)+2(x-y)-4(x-y)=3(x-y)次方-4(x-y)+7(x-y)-6(x-y)次方= 若｜x-y-5｜与｜2x+3y-15｜互为相反数,则x+y＝? 3x+y+5与2-4y+2x是同类项,求x,y 若5x+3y=3x+4y=x+2y+6,则x+y=___ 大括号x+y/2+x-y/3=11/6 4(x+y)-5(x-y)=7 快 初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) 求下列函数的定义域与值域：Y=3X y=8/X Y=-4X+5 Y=X平方-6X+7 1.3x+4y=256x+5y=38问：x与y各是多少?2.条件：7z-3=2y-6=4y-16=3x-8[y*y-(x*x+z*z)/x*x+y*y+z*z]乘以7/3=? |2x+3y-6|与(3x+4y-7)互为相反数,求x、y的值