Question

若½|2x-1|=-三分之一|y-4|,试求多项式1-xy-x²y

Answer 1

∴½|2x-1|=-三分之一|y-4|,

∴|2x-1|/2+|y-4|/3=0

∴2x-1=0,y-4=0

解得x=1/2,y=4

1-xy-x²y

=1-1/2×4-(1/2)²×4

=1-2-1

=-2