thu gọn các đơn thức sau rồi thì rõ quan hệ số phân biến và các bậc của đơn thức đó phần a 2x bình y mũ 3 nhân với mở ngoặc -3 x y bình đóng ngoặc phần b 1/2 bình x mũ 4 x mũ 2 nhân 4 y mũ 3 nhân x bài 2 tính giá trị biểu thức sau a = x bình cộng x y - 4 y bình tại x = 2 và y = -1 câu 2 thực hiện phép tính a đóng ngoặc 5 x bình - 3 x y + y bình đóng ngoặc cộng mở ngoặc x bình cộng x y - 4 y bình đóng ngoặc phần b mở ngoặc 3 x bình y bình trừ x y bình trừ 3 x y - 2 đóng ngoặc - mở ngoặc x bình y bình trừ 2x y + 4 đóng ngoặc

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