化简求值:(2x+y)(x-2y)-2x(x+y),其中x、y满足x2+y2-2x+4y=-5.
化简求值:(2x+y)(x-2y)-2x(x+y),其中x、y满足x2+y2-2x+4y=-5.
化简求值:已知x、y满足:x2+y2-4x+6y+13=0,求代数式(3x+y)2-3(3x-y)(x+y)-(x-3y
.先化简再求值:(2x+y)(2x+y)-(2x-y)平方其中X,Y满足X平方+Y平方-2X+4Y+5=0
先化简再求值:y(x+y)+(x-y)2-x2-2y2,其中x=-13
化简求值:[(x+2y)2-(x+y)(3x-y)-5y2]÷2x,其中x=-2,y=12
化简求值:(-3x2-4y)-(2x2-5y+6)+(x2-5y-1),其中x、y满足|x-y+1|+(x-5)2=0.
化简求值(x+5y)(x+4y)-(x-y)(x+y),其中x=一又2/5,y=-1/7
化简求值:【(x+Y)(X-Y)-(X-Y)的平方+2Y(2-Y)】除4Y,其中X=1 Y=2
已知x2-4x+2y2-4y+6=0,先化简再求值:(2x+y)(2x-y)-(2x-y)2.
先化简再求值[(x+y)2-(x+y)(x+3y)-4y2]÷2y,其中x=-2,y=12
化简求值(4x-2y)-[-2(x-y)+(2x+y)]-4x,其中x=0,y=-3.
化简求值:[(x+2y)2-(x-2y)2-(x+2y)(x-2y)-4y2]÷2x,其中x=-2,y=12