怎样计算:(x-1)(x-2)(x-3)(x-4) 有啥简便方法?
怎样计算:(x-1)(x-2)(x-3)(x-4) 有啥简便方法?
(x-1)(x-2)(x-3)(x-4)
=[(x-1)(x-4)][(x-2)(x-3)]
=[x^2-5x+4][x^2-5x+6]
=(x^2-5x)^2+10(x^2-5x)+24
=x^4-10x^3+35x^2-50x+24
(X-1)(X-2)(X-3)(X-4)=?简便方法
(X-1)(X-2)(X-3)(X-4) = [(x -1)(x-4)] * [(x-2)(x-3)] = [x^2 - 5x +4] * [[x^2 - 5x + 6] = (x^2 - 5x)^2 + (4 + 6)* (x^2 - 5x) + 4 * 6 = (x^2 - 5x)^2 + 10(x^2 - 5x) + 24 = x^2 - 10x^3 + 25x^2 + 10x^2 - 50x + 24 = x^4 - 10x^3 + 35x^2 - 50x + 24
(x-1)(x-2)(x-3)(x-4)怎么算,要用简便的方法来算
(x-1)(x-2)(x-3)(x-4)
=[(x-1)(x-4)][(x-2)(x-3)]
=(x^2-5x+4)(x^2-5x+6)
=(x^2-5x)^2+10(x^2-5x)+24
=x^4-10x^3+25x^2+10x^2-50x+24
=x^4-10x^3+35x^2-50x+24
(x-1)(x-2)(x-3)(x-4)(x-5)有几个极值点,求简便方法!!!
因为f(x)有5个零点x=1,2,3,4,5
因此在相邻的零点间(1,2),(2,3),(3,4), (4,5)都有一个极值点
因此它共有4个极值点
计算:(1)(-a)2?(a2)2÷(-a)3(2)(x-2)2-(x+3)(x-3)(3)20092-2010×2008(简便方法计算
(1)原式=a 2 ?a 4 ÷(-a 3 )
=-a 3 ;
(2)原式=x 2 -4x+4-(x 2 -9)
=x 2 -4x+4-x 2 +9
=13-4x;
(3)原式=2009 2 -(2009+1)(2009-1)
=2009 2 -(2009 2 -1)
=2009 2 -2009 2 +1
=1.
(x-1)(x-2)(x-3)(x-4)怎么算
(x-1)(x-2)(x-3)(x-4)
=[(x-1)(x-4)][(x-2)(x-3)]
=[x²-5x+4][x²-5x+6]
=(x²-5x)²+10(x²-5x)+24
==x^4-10x^3+35x^2-50x+24
(x-2)²+2(x-2)-3=0怎样用简便方法计算?
((X-2)-1)*((X-2)+3)=0就是前面的可以等于0后面的也可以等于0
f(x)=x(x-1)(x-2)(x-3)(x-4)计算f′(4)。 各位大神,像这样的题有什么简便
f(x)=x(x-1)(x-2)(x-3)(x-4)
f'(x)= (x-1)(x-2)(x-3)(x-4)+x(x-2)(x-3)(x-4)+x(x-1)(x-3)(x-4)+x(x-1)(x-2)(x-4)+x(x-1)(x-2)(x-3)
f'(4) =4(4-1)(4-2)(4-3)= 4.3.2.1= 24
1/(x-2)(x-3)-2/(x-1)(x-3)+1/(x-1)(x-2)用找规律的方法计算
思路就是把三个变成同底数:(x-1)(x-2)(x-3)。 1/(x-2)(x-3)-2/(x-1)(x-3)+1/(x-1)(x-2)=(x-1)/(x-1)(x-2)(x-3)-2(x-2)/(x-1)(x-2)(x-3)+(x-3)/(x-1)(x-2)(x-3)=(x-1)-2(x-2)+(x-3)/(x-1)(x-2)(x-3)=0/(x-1)(x-2)(x-3)=0
(x-1)(x-2)+(x-2)(x-3)-2(x-3)(x-4)<-4怎么做???
(x-1)(x-2)+(x-2)(x-3)-2(x-3)(x-4)<-4
x方-3X+2+X方-5X+6-2X方-14X-24<-4
-21X<12X
X>-12/21