Question

[Linh Khánh]

Thu gọn các đơn thức đồng dạng trong đa thức sau:

a) \(A=x^5-\dfrac{1}{2}x+7x^3-2x+\dfrac{1}{5}x^3+3x^4-x^5+\dfrac{2}{5}x^4+15\)

b) \(B=3x^2-10+\dfrac{2}{5}x^3+7x-x^2+8+7x^2\)

c) \(C=\dfrac{1}{7}x-2x^4+5x+6\)

Answer 1

[oanh nguyen]

a)A=\(x^5-\dfrac{1}{2}x+7x^3-2x+\dfrac{1}{5}x^3+3x^4-x^5+\dfrac{2}{5}x^4+15\)

=\(=\dfrac{-5}{2}x+\dfrac{36}{5}x^3+\dfrac{17}{5}x^4+15\)

b)B=\(3x^2-10+\dfrac{2}{5}x^3+7x-x^2+8+7x^2\)

\(=9x^2+\dfrac{2}{5}x^3+7x+2\)

c)C=\(\dfrac{1}{7}x-2x^4+5x+6\)

Answer 2

[oanh nguyen]

c)C=\(\dfrac{36}{7}x-2x^4+6\)