-2(x-1)-3(1-2x) -2(x的平方-1)-3(1-2x的平方)
=-2x+2-3+6x-2x²+2-3+6x²
=4x²+4x-2
2 (x-1/2y)-3(x-y)
=2x-y-3x+3y
=-x+2y