(x² 5x 3)(x² 5x-2)-6
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(x3+5x2+4x-1)-(-x2-3x+2x3-3)+(8-7x-6x2+x3)=x3+5x2+4x-1+x2+3x-2x3+3+8-7x-6x2+x3=x3-2x3+x3+5x2+x2-6x2+
(1+x)^2(1-x)^5这个有点像组合比如从(1+x)^2中取x^2,则(1-x)^5中得取一个-x和4个1即x^2.(-x).1.1.1.1=-x^3.总的就分为三种(1+x)^2:1、x、x^
x³-2x²-4x-5=(x³-2x²+x)-(5x-5)-10=x(x-1)²-5(x-1)-10将x=1+√5代入原式=(1+√5)(1+√5-1
X=2.3X=4
x(x²+5x-6)-x(5x+4)=x³-5x³+5x²-6x-5x²-4x=x³-510x=5x=1/2如仍有疑惑,欢迎追问.祝:
f(x)=x²-x-5g(x)=1/3x³-5/2x²+4xg'(x)=x²-5x+4y=g'(x)/[f(x)+9]=(x²-5x+4)/(x
1.3x²-5x+2=(3x+1)(x-2)2.x³-2x²-3x=x(x²-2x-3)=x(x-3)(x+1)3.x²-6x-16=(x-8)(x+
(-5)x3/13+(-5)x(-2/13)-5X1/13+0.125x(-14/13)x(-8)=-5x(3/13-2/13-1/13)+1/8x(-14/13)x(-8)=0-14/13=-14/
(1+x+x^2+x^3)^2-x^3设y=1+x+x^2,则(x^3-1)=(x-1)*(1+x+x^2)=(x-1)*y,原式=(y+x^3)^2-x^3=y^2-2*y*x^3+x^6-x^3=
原式=x3-2x2+x-4-2x3+5x+4=-x3-2x2+6x.
3与(9-x)之间是乘号吗.若是则解为x=4.若不为乘号则5x+27x-3x2=35.-3x2+32x-35=0.则解为x=16+根号1511/3.或x=16-根号151/3
因为x3+3x+5=7,x3+3x=23x3+9x-2=3(x3+3x)-2=3*2-2=4
因为y=log2(t)是增函数,若求该函数的减区间,则需求t=2x方-5x-3的减区间,即为(5/4,正无穷),又因为有定义域的限制,所以求其交集即为x>3
原式=x3+5x2+4x-1+x2+3x-2x3+3+8-7x-6x2+x3=10,故与x无关.
原式=a(2-4+6)+b(8+2)+8-5=4a+10b+3
似乎 有问题,建议查一下系数.
2x+5a≤3(x+2)①x-a2≤x3②,由①得:x≥5a-6;由②得:x≤34a,∴5a-6≤x≤34a,由题意得:34a>4或5a-6<-1,解得:a<1或a>163.
(x-1)(x^2+ax+2)=x^3+ax^2+2x-x^2-ax-2=x^3+(a-1)x^2+(2-a)x-2=0a-1=-12-a=-1不合理(x-2)(x^2+ax+1)=x^3+ax^2+
-27x^3+8=2^3-(3x)^3=(2-3x)(4+6x+9x^2)(x^2-5x+2)(x^2-5x+4)-24=(x^2-5x)^2+6(x^2-5x)+8-24=(x^2-5x)^2+6(
5x-(120-x)x3.75=162.55x-450+3.75x=162.58.75x=612.5x=70