3(x-5)²=2(5-x)
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
解方程(x-2)X(x的平方-6x-9)=x(x-5)X(x-3)
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
4x/(x²+x+3) + 5x/(x²-5x+3)= - 3/2
已知(x+1)(x²+2x+3)=x³+3x+5x+3,那么,将x³+3x²+5
解方程①(x+3/x-1)²-5(x+3/x-1)+6=0 ②x²-2/x+3-6x+18/x
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
5x²+[x²+(5x²-2x)]-2(x²-3x),其中x=-1
初一数学x*x+2x+5的值为7,请求3x*x+6x+3的值.因为x*x+2x2x+3=3x(x*x+2x)+2x+2x
已知(x-2)(x²-6x-9)=x(x-5)(x-3),求6x的算术平方根
(先化简后求值)(3x/x+2-x/x-2)+2x/x^2-4,x=4-根号5,