Question

y=3分之1x的平方-2x+4怎样配方?

Answer 1

y=1/3 x²-2x+4

=1/3(x²-6x)+4

=1/3(x²-2·3·x+3²-3²)+4

=1/3[(x-3)²-9]+4

=1/3(x-3)²-3+4

=1/3(x-3)²+1