16﹙x 3﹚ 12x=24×﹙x x 3﹚×﹙1-2 5﹚
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/12 01:55:50
(1)f′(x)=3(x+1)(x-1),当x∈[-3,-1)或x∈(1,32]时,f′(x)>0,∴[-3,-1],[1,32]为函数f(x)的单调增区间,当x∈(-1,1)为函数f(x)的单调减区
ok再答:x3+x+2=x3-x+2x+2=x(x2-1)+2(x+1)=x(x-1)(x+1)+2(x+1)=(x+1)(x2-x+2)=0所以x+1=0或x2-x+2=0x+1=0时x=-1x2-
X³-3X=X(X²-3)=X(X+√3)(X-√3)
(x³+x³-14x-24)÷(x+2)=x²-x-12.由x³+x²-14x-24=x³-x³-12x+2x²-2x-
51-4.5x=51*3-30x移项30x-4.5x=51*3-5125.5x=102x=4移项变号.
x-3/4x=181/4x=18x=18/(1/4)x=18乘4x=6436+0.6X=420.6X=42-360.6X=6x=103/5x=1/3x=1/3乘5/3x=1/5(/这个为分数线,望采纳
(X+4)(X+2)(X+3)
(12+x)x3=46+x36+3x=46+x3x-x=46-362x=10x=5
(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=
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
46+x=3(12+x)46+x=36+3x3x-x=46-362x=10x=10÷2x=5
∵3x3-x=1,∴9x4+12x3-3x2-7x+2001,=3x(3x3-x-1)+4(3x3-x-1)+2005,=2005.故选D.
(Ⅰ)f'(x)=x2+(m+1)x+1,…(2分)①当△≤0,即(m-1)2-4≤0,-1≤m≤3时,函数f(x)在(-∞,+∞)内单调递增;…(4分)②当△>0,即m<-1或m>3时,令f'(x)
x+12=16x=4
2x3-3x+三分之二x3-2x-三分之四x3+x-1=4/3x3-4x-1=4/3x(-1/2)3+4x1/2-1=-4/3x1/8+2-1=1-1/6=5/6
∵f(x)=x3-12x2-2x+5,∴f′(x)=3x2-x-2,由f′(x)=3x2-x-2>0,解得x>1,或x<−23所以原函数的单调增区间为(-∞,−23),(1,+∞).故答案为(-∞,−
x^3+x=192x(x^2+1)=192f(x)=x(x^2+1)是单调增函数所以可以用逼近法做5^3+5
x³+x²+12x=x(x²+x+12)=0所以x1=0或者x²+x+12=0对于后面,△
去分母得:2x-3(3x+1)=24-(5x-3),去括号得:2x-9x-3=24-5x+3,移项合并得:-2x=30,系数化为1得x=-15.
x3﹙m-2﹚+4x﹙2-m﹚,=x³(m-2)-4x(m-2)=x(m-2)(x²-4)=x(m-2)(x+2)(x-2)当x=0.4,m=2时原式=0.4×3.5×2.4×(-