Phân tích đa thức thành nhân tử

Cho a,b,c dương thỏa mãn a+b+c=3. Chứng minh rằng

    abc(1+a^2)(1+b^2)(1+c^2)≤8

He drives carelessly. His mother worries about him.

=> If .......

Although he was able to do the job, he wasn't given the position.

=> Despite .......

???