已知：多项式x²-（3k-1）xy-3k²+3mxy-8中不含xy项,求8^k×4÷2^3m+2_数学解答

已知：多项式x²-（3k-1）xy-3k²+3mxy-8中不含xy项,求8^k×4÷2^3m+2

人气：260 ℃　时间：2020-10-01 20:59:53

解答

-(3k-1)+3m=0
3m-3k+1=0
3m-3k=-1
8k+1次方×4÷2的3m+2次方
=8^(k+1)×4÷2^(3m+2)
=2^3(k+1)×2^2÷2^(3m+2)
=2^[3(k+1)+2-(3m+2)]
=2^[3k+3+2-3m-2]
=2^[3k-3m+3]
=2^[-1+3]
=2^2
=4