Question

已知x=1/2是方程(2x-m)/4-1/2=(x-m)/3的根,求代数式1/4(-4mm+2m-8)-(1/2 m-1

Answer 1

(2x-m)/4-1/2=(x-m)/3

x=1/2代入得:

(1-m)/4-1/2=(1/2-m)/3

m=5

1/4(-4mm+2m-8)-(1/2 m-1)

=1/4(-100+10-8)-(1/2*5-1)

=-49/2-3/2

=-26