2XY(X2+ XY 3Y2) B
Bài 1. Tính:a. 2xy(x
2
+ xy 3y2
) b. (x + 2)(3x2
4x) c. (x – 4)(x2
+ 3x – 1)d. (x – 1)(x – x2
+ 4) e. (2x2
xy+ y2
).(2x3
) f. (2x – 1)(x + 2)(3 – x)2
+ xy 3y2
) b. (x + 2)(3x2
4x) c. (x – 4)(x2
+ 3x – 1)d. (x – 1)(x – x2
+ 4) e. (2x2
xy+ y2
).(2x3
) f. (2x – 1)(x + 2)(3 – x)