Question

化简并求值:1/2*a-[4b-c-(1/2*a-c)]+[6a-(b-c)],其中a=0.1,b=0.2,c=0.3

Answer 1

a/2-[4b-c-(1/2*a-c)]+[6a-(b-c)]

=a/2-[4b-c-(a/2-c)]+[6a-b+c]

=a/2-[4b-c-a/2+c]+[6a-b+c]

=a/2-[4b-a/2]+[6a-b+c]

=a/2-4b+a/2+6a-b+c

=a-4b+6a-b+c

=7a-5b+c

=7*0.1-5*0.2+0.3

=0.7-1+0.3

=0