【1】 9(2x-y)^2-16(x+2y)^2【2】 121(a-b)^2-169(a+b)^2【3】 n^2(m-2)-n(2-m)【4】 (x^2-2x)^2-2x(2-x)+1
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因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y
1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/(x^2-5x+6)+(x^2-3x+8)/(x^2-4x+3)2.{(x^2)/(x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{(x^2/x^2+y^2)^2}
{5(x-3y)-6=2x+1 3(x+6y)+4=9y+19 {3分之2(x-y)=4分之x+y-1 6)x+y)=4(2x-y)+16
计算:1.(x-1)^2+2(1-x) 2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y)1.(x-1)^2+2(1-x)2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y)
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
化简1/2x-1/x+y(x+y/2x-x-y)
计算2x/1-x+y/1·(2x/x+y-x-y)
1/2x-(x+y/2x -x-y)÷(x+y)
9(x+y)^2-16(x-y)^2
化简:(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9)
先化简再求值 x(9x-y)-y(y-x)+(x-y)的平方,其中x=-1,y=2
试说明(4x*x-7X+6Y--1)-(-2x*x+3y*y+2Y+2X)+(-6X*X+9X-Y)的值于X无关.
(x-y)(x-y)2(y-x) (x+2y-?)(x-2y+?)
导数的计算练习题导数的计算(1)y=x^5 (2)y=sinx(3)y=1/x^3(4)y=5^√x(5)y=cosx(6)y=5^x(7)y=log3^x(8)y=lnx(9)f(x)=x^3-x^2-x+1(10)y=2x^3-3x^2+4x-1(11)y=x inx(12)y=xsinx-cosx(13)y=cosx/x(14)y=3x(x^2+2)(15)f(x)=(x-1)^2+3(x-1)(16)f(x)=1
因式分解-x^3+2x^2y-xy^2和16(x-y)^2-9(x+y)^2和(x+2)(x+4)+x^2-4
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
9(x+y)2-(x-y)2怎么算,还有:(x-2)(x-4)+1和:(x+y)²-4(x+y-1)
计算:(1)(x+y)^9/(x+y)^5(2)(x^2+x+1)/(3)0.0001^0(4)(x+3y/2x-y)^-4