已知a^3+2a=-2,求3a^6+12a^6-a^3+12a^2-2a-4的值是3a^6+12a^4-a^3+12a^2-2a-4还有一题:已知m,n,p都是整数，且|m-n|^3+|p-m|=1,求|p-m|+|m-n|+2|n-p|的值分数好商量,40?

Question

已知a^3+2a=-2,求3a^6+12a^6-a^3+12a^2-2a-4的值
是3a^6+12a^4-a^3+12a^2-2a-4
还有一题:已知m,n,p都是整数，且|m-n|^3+|p-m|=1,
求|p-m|+|m-n|+2|n-p|的值
分数好商量,40?

Answer 1

是3a^6+12a^4-a^3+12a^2-2a-4吧
3a^6+12a^4-a^3+12a^2-2a-4
=3a^3(a^3+2a)+6a(a^3+2a)-(a^3+2a)-4
=3a^3*(-2)+6a*(-2)-(-2)-4
=-6a^3-12a-2
=-6(a^3+2a)-2
=-6*(-2)-2
=12-2
=10