(1)(3y-2)²-5(3y-2)=14 (2)(x+6)(x-7)=14
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已知3y²-2y+6=8,求3/2y²-y+1的值2.已知(x²+y²)(x²+y²-1)=12,求x²+y²的值3.若xy≠0且,x²-5xy+6y²=0求x/y的值
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
(3y-1)²=(y-3)²+2y²不要用开根号
(3x-y)²-(2x+y)²+5y²
分解因式:2x²-8xy+5y²6x²-9x-4242x²-85xy+42y²3x²-5xy-y²(2x-y+3)(2x-y+1)-15(x+y)²+4(x+y)(3x-y)+4(3x-y)²完全按照原题打的
七年级因式分解题,要过程.1.x²(y²-9)+4(9-y²)2.(x-2y)²-3(x-2y)-103.6(x^n+1)+5(x^n)y-4(x^n-1)y²4.9-a²-b²+2ab5.x²-2xy+y²+4x-4y+46.(x+y)²-4(x+y+-1)7.(ax+by)²+(bx-ay)²8.(c-a)²-4(b-c
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y²-y+17/4=0已知、x+y=6且xy=4(1)x²+y² (2)(x-y)² (3)x{四次方}+y{四次方}第一题没错 书上就这样写的!
分式通分题,1.-y/4x²,x²/3y²,2/5xy2.3x/x²-y²,2y/xy-y²,5/2x+2y3.a-b,1/a-b
指出下列多项式的次数和项数.①3x²-2x²y+4x²y²②-2+4x²y-1/2xy²-3y³+5y^4
化简2y²﹢6y-3y²-5y=
1.(b²+2a²)(2a²-b²) 2.(4x²-4y²)(x²+y²) 3.—(x-1)(x+1)-3(x+2)(x-2) 4.(5y²+4x²)[4y²+(2x-y)(-2x-y)]
1·已知a+b+c=0且a²+b²+c²=1,求ab+bc+ac的值.2·已知x,y满足等式x²+y²-4x+y+17/4=0,求(x+y)²的值.3·已知x+y=5,x²+y²=13,求代数式x²y+2x²y²+xy²的值.4·若a²+b²+
(1) (m—n)²—n² (2)49(a-b)²—16(a+b)²(3) (2x+y)²—(x+2y)² (4) (x²+y²)²—x²y²(5)3ax²—3ay²
x/y=2,求x²-3xy+y²/2x²-3xy+5y²
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 =
(1) [(-1/3)x²y][(3/4)y²-(1/2)x+(1/3)](2) 12x²y[(-2/3)x²-(5/6)xy+(3/4)y²](3) (4x²-y²)[(2x+y)²-(2x-y)²]注:“/”是分数线,1/2是二分之一
计算:(3x²+2y+1)-(2x²+3y-5)
已知4x²+y²-4x-6y+10=0,求(2x/3*√(9x)+y²√(x/y³))-(x²*√(1/x)-5x*√y/x))4x²+y²-4x-6y+10=0,4x²-4x+1+y²-6y+9=0(2x-1)²+(y-3)²=0x=1/2y=3这个我看不懂