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△x1+[(△x1-△x2)/(x2-x1)](x-x1) △x1-[(△x2-△x1)/(x2-x1)](x-x1) △x1+[(△x2-△x1)/(x2-x1)](x-x1) △x1+[(△x2-△x1)/(x2-x1)](x1-x)
x2﹣1=(x﹣1)2 x2+2x﹣1=(x+1)2 2x2﹣2=2(x+1)(x﹣1) x2﹣6x+9=x(x﹣6)+9
x2 + 2x -1=(x - 1)2 - x2 +(-2)2 =(x - 2)(x + 2) x3- 4x = x(x + 2)(x - 2) (x + 1)2 = x2 + 2x + 1
存在x1,x2∈R,使(f(x2)﹣f(x1))(x2﹣x1)<0 对任意x1,x2∈R,都有(f(x2)﹣f(x1))(x2﹣x1)≤0 存在x1,x2∈R,使(f(x2)﹣f(x1))(x2﹣x1)≤0 对任意x1,x2∈R,都有(f(x2)﹣f(x1))(x2﹣x1)<0
-x2+(-2)2=(x-2)(x+2) x2+2x-1=(x-1)2 4x2-4x+1=(2x-1)2 x2-4x=x(x+2)(x-2)
{x|1≤x≤2} {x|x≥1或x≤2} {x|1{x|x>1或x<2}
f(x)=x2+2x+1 f(x)=x2﹣2x+1 f(x)=x2+2x﹣1 f(x)=x2﹣2x﹣1
f(x)=x2+1 f(x)=x2+2x-1 f(x)=x2-1 f(x)=x2+2x+1
{x|x>2或x<1} {x|x≥2或x≤1} {x|1≤x≤2} {x|1<x<2}
x2﹣2x﹣1=(x﹣1)2 2x2﹣2=2(x+1)(x﹣1) x2y﹣xy=y(x2﹣x) x2﹣2x+2=(x﹣1)2+1
2x2﹣2=2(x+1)(x﹣1) x2+2x﹣1=(x﹣1)2 x2+1=(x+1)2 x2﹣x+2=x(x﹣1)+2
∃x1,x2∈R.,(f(x2)-f(x1))(x2-x1)≤0 ∀x1,x2∈R.,(f(x2)-f(x1))(x2-x1)≤0 ∃x1,x2∈R.,(f(x2)-f(x1))(x2-x1)<0 ∀x1,x2∈R.,(f(x2)-f(x1))(x2-x1)<0
{x| x<-2或x>1} {x| -2 {x| x<-1或x>2} {x| -1
{x|x>2或x<1} {x|x≥2或x≤1} {x|1≤x≤2} {x|1<x<2}
f(x﹣1)=2x+2(0≤x≤2) f(x﹣1)=﹣2x+1(2≤x≤4) f(x﹣1)=2x﹣2(0≤x≤2) f(x﹣1)=2x﹣1(2≤x≤4)
f(x-1)=2x+2(0≤x≤2) f(x-1)=2x-1(2≤x≤4) f(x-1)=2x-2(0≤x≤2) f(x-1)=-2x+1(2≤x≤4)
-x2+(-2)2=(x-2)(x+2) x2+2x-1=(x-1) 4x2-4x+1=(2x-1)2 x2-4x=x(x+2)(x-2)