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a(x-y)=ax-ay x2+2x+1=x(x+2)+1 (x+1)(x+3)=x2+4x+3 x3-x=x(x+1)(x-1)
a(x-y)=ax-ay +2x+1=x(x+2)+1 (x+1)(x+3)=+4x+3 -x=x(x+1)(x-1)
a(x-y)=ax-ay x2+2x+1=x(x+2)+1 (x+1)(x+3)=x2+4x+3 x3-x=x(x+1)(x-1)
a(x-y)=ax-ay x2+2x+1=x(x+2)+1 (x+1)(x+3)=x2+4x+3 x3-x=x(x+1)(x-1)
y=与y=x+3 y=-1与y=x-1 y=x0(x≠0)与y=1(x≠0) y=2x+1,x∈Z.与y=2x-1,x∈Z.
x6÷x3=x2 (x-1)2=x2-1 x4+x4=x8 (x-1)2=x2-2x+1
x6÷x3=x2 (x-1)2=x2-1 x4+x4=x8 (x-1)2=x2-2x+1
y=x-1 y=-x+1 y=2x-2 y=-2x+2
3-(x-1)=2-x 3-(x-1)=2+x 3-(x-1)=4-x 3-(x-1)=4+x
(x-1)2 x(x-1)2 x(x2-2x+1) x(x+1)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)
x2-x=x(x-1) a(a-b)=a2-ab (a+3)(a-3)=a2-9 x2-2x+1=x(x-2)+1
3*x^n/(2*x-1) 3*x**n/(2*x-1) 3*pow(x,*(1/(2*x-1)) 3*pow(n,/(2*x-1)