1.-2a^3+4a^2-2a2.(x-2)^2+2(2-x)3.1.345^3-1.345*0.345*2.69+1.345*0.345^2(注意：这一题不要因式分解，要简便计算)

Question

1.- 2a^3+4a^2-2a
2.(x-2)^2+2(2-x)
3.1.345^3-1.345*0.345*2.69+1.345*0.345^2(注意：这一题不要因式分解，要简便计算)

Answer 1

1.- 2a^3+4a^2-2a
=-2a(a^2-2a+1)
=-2a(a-1)^2
2.(x-2)^2+2(2-x)
=(2-x)^2+2(2-x)
=(2-x)(2-x+2)
=(2-x)(4-x)
3.1.345^3-1.345*0.345*2.69+1.345*0.345^2
=1.345(1.345^2-2*0.345*1.345+0.345^2)
=1.345(1.345-0.345)^2
=1.345