(2x-y+7)²+│4x+3y-1│=0 求x的y次方

1.(8xy-x²+y²)-(x²-y²+8xy)2.(2x²-1/2+3x)-4(x-x²+1/2)3.3x²-[7x-(4x-3)-2x²] 计算：4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急 （3x-2y)²(3x-2y)²(9x²+4y²）² 1（x-3x-1）（x+3y-1)2（3x-2y+1/4）²3（a+b)²-（a-b）²4 [2x²-（x+y)(x-y)][（-x-y)×（y-x)+2y²],其中x=1 y=25[（0.5x-y)²+（0.5x+y)²]（0.5x²-2y²）6（a+3b)²-2（a+3b)(a-3b)+(a-3b)²7 4m²（2x-3y)²-m²（3x-2y)²=? 已知4x²-3y²=7,3y²+2y²=19,求14x²-2y的值 因式分解：(2x+3y)²-4y² 因式分解2x(x-y)^4 - x²(x-y)² + xy(y-x)²RT 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² + xY- 2Y² =求x² - 4x Y+ Y² = 已知2x+3y=0,求代数式1.5x+4y/3x-2y 2.x²+xy-y²/x²-xy+y² 计算x²-x/x²×x/1-x和x²-4y²/x²+2xy+y²÷x+2y/x²+xy 对于实数x.y,求2x²+3y²-4xy-5x-6y+7的最小值 (2x-y+7)²+│4x+3y-1│=0 求x的y次方 因式分解 x^4-2x²y²-4xy^3+4x^3y+y²(4x²+3y²/4) 已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值 1、(-3x-4y)·( )=9x²-16y² 2、如果x+y=6,xy=7,那么x²+y²=__ (x-y)²=___ 在线求助完全平方公式因式分解(1)-a²-1+2a(2)2x²y-x²-xy²(3)4x²-20x+25(4)(x²+1)²-4x²(5)(2x-y)²-2(2x-y)+1(6)(x+y)²-2(x²-y²)+(x-y)² x²-4y² x+2y---------- ÷ --------分数线x²+2xy+y² x²+xyx²-4y² x+2y----------÷--------分数线x²+2xy+y² x²+xy(x+2y)(x-2y)x(x+y)=----------------(x+y)(x+y)(x+2y)(x-y)x=------(x+y)这样对了吗?