(1)2x^2-4x (2)4x^2-9 (3)x^2-4x+4 (4)(x+y)^2-14(x+y)+49 (5)(-

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(1)2x^2-4x (2)4x^2-9 (3)x^2-4x+4 (4)(x+y)^2-14(x+y)+49 (5)(-2)^101+(-2)^100

(1)2x^2-4x
=2x(x-2)
(2)4x^2-9
=(2x+3)(2x-3)
(3)x^2-4x+4
=(x-2)²
(4)(x+y)^2-14(x+y)+49
=（x+y-7)²
(5)(-2)^101+(-2)^100
=-2*(-2)^100+(-2)^100
=(-2)^100*(-2+1)
=-2^100

y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1 x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 （x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3) (1)2x^2-4x (2)4x^2-9 (3)x^2-4x+4 (4)(x+y)^2-14(x+y)+49 (5)(- x^2-y^2/x+y-4x(x-y)+y^2/2x-y, 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( (x+3y-4)(2x-y) 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y 9y=3x-(x-1),4(x+y)-(2x+4)=8y 计算(x+4)·(-2x)-(x+1)(x-1)+(-3x+2)(x+1)；（3x-y)(y+3x)-(4x-3x)( 已知4x=9y求(1)x+y/y (2)y-x/2x