化简求值:5(3a^b-ab^2)-(ab^2+3a^2b),其中a=1/2,b=1/3

问题描述:

化简求值:5(3a^b-ab^2)-(ab^2+3a^2b),其中a=1/2,b=1/3

=15a^2b-5ab^2-ab^2-3a^2b
=12a^2b-6ab^2
=12*1/2*1/2*1/3-6*1/2*1/3*1/3
=2/3

=15a^2b-5ab^2-ab^2-3a^2b
=12a^2b-6ab^2
=12*1/2*1/2*1/3-6*1/2*1/3*1/3
=2/3