Question

1/2x-2(x-1/2y的平方)+（-3/2x+1/3y的平方）+（-3/2x+1/3y的平方）的值，其中x=-2,y=2/3

Answer 1

1/2x-2(x-1/2y的平方)+（-3/2x+1/3y的平方）+（-3/2x+1/3y的平方）
=1/2x-2x+y^2-3/2x+1/3y^2-3/2x+1/3y^2
=1/2x-2x-3/2x-3/2x+y^2+1/3y^2+1/3y^2
=-9x/2+5/3y^2
=-9*-2/2+5/3*(2/3)^2
=9+20/9
=101/9

Answer 2

1/2x-2(x-1/2y的平方）+(-3/2x+1/3y的平方）+(-3/2x+1/3y的平方）
=1/2x-2x+1-3/2x+1/3y的平方-2/3x+1/3y的平方
=-1又1/2x-3/2x-2/3x+1/3y的平方+1/3y的平方
=-3又2/3x+2/3y的平方+1

=-11/3X(-2)+2/3X(2/3)的平方+1
=22/3+2/3X4/9+1
=22/3+8/27+1
=198/27+8/27
=206/27