2000/x-5-1800/x=0.25
已知3x*x-x=1,求6x*x*x+7x*x-5x+2000
x+5x=150
已知3x-x=1,求6x+7x-5x+2000的值.
若x满足x^5 +x^4+x=1,则x^1998+ x^1999+ x^2000+ x^2001+ x^2002+ x^
x(2x-1)=-3x(x+1)+5x²+3
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!)+.
x+3/4x=0.25(方程)x-2/5=9/10(同样,方程)
4x(5x-2)=3(5x-2)
X-1/6X-1/5X=33
6x+3=7x(x+5)
(x-1)²-(x-1)(x+5)=17
5x-2=3x+4 x等于什么?