3x(2x-7)=5x² ,2(x+3)²=3x+16
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
f(x)=x²+3x|x-2|
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
2x+3x+4x+5x+x+6x+7x=100
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
3x(2x-7)=5x² ,2(x+3)²=3x+16
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
5x²+[x²+(5x²-2x)]-2(x²-3x),其中x=-1
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1
已知(x-2)(x²-6x-9)=x(x-5)(x-3),求6x的算术平方根