Question

Phân tích đa thức thành nhân tử:0,125.(a+1)³-1

Answer 1

\(0,125.\left(a+1\right)^3-1=\left[0,5\left(a+1\right)\right]^3-1^3=\left(0,5a+0,5-1\right)\left(0,5a+0,5+1\right)=\left(0,5a-0,5\right)\left(0,5a+1,5\right)=0,5\left(a-1\right).0,5\left(a+0,3\right)=0,25\left(a-1\right)\left(a+3\right)\)

Answer 2

\(0,125.\left(a+1\right)^3-1=\left(0,5a+0,5\right)^3-1=\left(0,5a+0,5-1\right)\left[\left(0,5a+0,5\right)^2+\left(0,5a+0,5\right)+1\right]=0,5\left(a-1\right)\left(0,25a^2+0,5a+0,25+0,5a+0,5+1\right)=\left(0,5a-0,5\right)\left(0,25a^2+a+1,75\right)\)