Question

1, thực hiện phép tính:

a, -5 (2x+1) + 3 (2-3x)

b, (2x-5) (3+x) + (4x-3) (2x-3)

c, 4 (3x-5) -7 (2x-1)

d, (3-4x) (5-x) - (4x+11)
 

Answer 1

a: =-10x-5+6-9x=-19x+1

b: \(=2x^2+6x-5x-15+8x^2-12x-6x+9\)

\(=10x^2-17x-6\)

c: \(=12x-20-14x+7=-2x-13\)

d: \(=15-3x-20x+4x^2-4x-11=4x^2-27x+4\)

Answer 2

a.

\(=\) \(-10x-5+6-9x\)

\(=1-19x\)

b.

\(=6x+2x^2-15-5x+8x^2-12x-6x+9\)

\(=10x^2-17x-6\)

c.

\(=12x-20-14x+7\)

\(=-2x-13\)

d.

\(=15-3x-20x+4x^2-4x-11\)

\(=4x^2-27x+4\)