用配方法解x^2+x-3,4x^2+8x-5,用换元法解(a-2b)^2+(a-2b)-12,(x+y)^2-4(x+y
用配方法解x^2+x-3,4x^2+8x-5,用换元法解(a-2b)^2+(a-2b)-12,(x+y)^2-4(x+y
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
分解因式1.2a(x-y)-3b(y-x)2.-x^y-2xy+35y3.a^(x-y)-4b^(x-y)若|a+2|+
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
(x+y)(a-2b)
几道因式分解..4ab(a+b)^2-6a^2b(a+b)(x+y)^2(x-y)+(x+y)(x-y)^22a(a-3
已知集合A={(x,y)| (y-3)/ (x-1)=2,x,y∈R},B={(x,y)| 4x+ay=16,x,y∈
已知集合A={y=x^2-2x-3},B={x|x^2+4x-5
(1)将抛物线y=x^2+2x+5化成y=a(x+m)^2+k (2)用配方法将二次函数y=4x^2+8x化为y=a(x
a*b=2×a+b 计算x*2x*3x*4x*5x*6x*7x*8x*9x=3039 x=
化简3x^2y+(2x-5x^2y)还有2x-(2-5x),a-(2a-3b)+(3a-4b),8x+2y+2(5x-2
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3