Rút gọn: B = ( x - 3 ) × ( x + 2 ) - ( 2x^3 - 2x^2 - 10x ) ÷ 2

Bài 1: Rút gọn: B = ( x - 3 ) × ( x + 2 ) - ( 2x^3 - 2x^2 - 10x ) ÷ 2
C= ( -4x^3 y^3 + x^3 y^3 ) ÷ 2xy^2 - xy × ( 2x - xy )
Bài 2: tìm x, y ( nếu có )
a) ( x - 2 )^2 - ( x + 2 ) × ( x^2 - 2x + 4 ) + (3x - 2 ) × ( 2x - 3 ) = 0