Question

已知2的a次方等于3,2的b次方等于6,2的c次方等于12,求-2a+b+c的值

Answer 1

2^b/2^a=6/3=2

2^(b-a)=2

2^c/2^b=12/6=2

2^(c-b)=2

b-a=1

c-b=1

c=b+1

a=b-1

-2a+b+c

=-2b+2+b+b+1

=3

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