Question

悬赏！几道八年级因式分解的数学题

1.因式分解：2a(x²+1）²-2ax²
2.83²-83×34+17²=
3.已知x²-y²=12，x-y=2,则x／y=
4.已知x+1/x=3,那么x的四次方加X的四次方分之一=
5.已知a²+b²+2a-4b+5=0,，求的2a²+4b-3值
6.已知x+y=1,则1/2 x² +xy+1/2 y²=

Answer 1

1. 2a(x²+1+x)(x²-x+1)
2. 83²-83×34+17²=83²-2×83×17+17²=(83-17)²=4356
3 (x+y)(x-y)=12 x-y=2 x+y=6 x=4 y=2 x/y=2
4. x^4+1/x^4=x^4+1/x^4+2-2=(x²+1/x²)²-2=[(x+1/x)²-2]²-2=47
5.(a+1)²+(b-2)²=0 a=-1 b=2 2a²+4b+3=13
6. 1/2(x²+2xy+y²)=1/2(x+y)²=1/2

Answer 2

1 2a(x2+1+x)(x2+1-x)