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已知x²-x-1=0,求-x³+2x²+2014的值...

x=-0.5 2x²/(x²-1)-x/(x+1) ={2x²-x(x-1)}/(x²-1) =(2x²-x²+1)/(x²-1) =(x²+1)/(x²-1) =(0.5²+1)/(0.5²-1) =1.25/(-0.75) =-5/3

y=x^2(1-x^2) y'=2x(1-x^2)+x^2(-2x) =2x-2x^3-2x^3 =2x-4x^3 =2x(1-2x^2) 令y'=0,则x=0或者x=±√2/2. 即: 单调增区间为:[-√2/2,0)∪(√2/2,+∞) 单调减区间为:(-∞,-√2/2)∪[0,√2/2]

若非零实数a,b(a≠b)满足,a²+a-2014=0,b²+b-2014=0, ∴a+b=-1; ab=-2014; 求1/a+1/b的值 =(a+b)/(ab) =(-1)/(-2014) =1/2014; 您好,很高兴为您解答,skyhunter002为您答疑解惑 如果本题有什么不明白可以追问,如果满意记得采纳 ...

m,n是方程x²+2013x+7=0的两根 ∴m²+2013m+7=0 n²+2013n+7=0 m+n=-2013 mn=7 ﹙m²+2012m+6﹚﹙n²+2014n+8﹚ =(m²+2013m+7-m-1)(n²+2013n+7+n+1) =-(m+1)(n+1) =-[mn+(m+n)+1] =-(7+2013+1) =-2021

您好: 1):(-½x²y)三次方·y² =-1/8x的6次方y的3次方*y² =-1/8x的6次方y的5次方 2):2x的三次方(x的三次方)²-(3x的三次方)³+5x²·x七次方 =2x的3次方*x的6次方-9x的9次方+5x的9次方 =2x的9次方-4x的9次...

m²+2m-2=0 m²+2m=2 所以m³+3m²+2014 =(m³+2m²)+m²+2014 =m(m²+2m)+m²+2014 =2m+m²+2014 =2+2014 =2016

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