Question

已知A=a的4次方-2a的二次方+1,B=-3a的4次方+2,计算3A-B

Answer 1

A=a^4-2a^2+1,

B=-3a^4+2,

3A=3a^4-6a^2+3

3A-B=3a^4-6a^2+3+3a^4-2=6a^4-6a^2+1