Question

Bài 1: thực hiện

a) (x^2-3)(2+4x)

b) 6.(3x+5)(x-4)

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

d) 3x(4x-3) +(2x-1)(6x+5)

e)2(3x-1)(2x+5)-(4x-1)(3x-2)

Giúp em nha plsssss,  e cực gấp luôn ạ TvT

Answer 1

Ai giúp em đi ạ

Em hứa sẽ vote nhiệt tình luôn huhuuu

Answer 2

a, (x² - 3)(2 + 4x)

= 2x² + 4x³ - 6 - 12x

b, 6(3x + 5)(x - 4)

= (18x + 30)(x - 4)

= 18x² - 72 + 30x - 120

= 18x² + 30x - 192

Answer 3

mk ko chắc lắm nhoa

Answer 4

a, (x²-3)(2+4x)

=2x²+4x³-6-12x

b,6.(3x+5)(x-4)

=6.(3x²-12x+5x-20)

=6.(3x²-7x-20)

=18x²-42x-120

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

=7-(5-3x-10x+6x²)

=7-(6x²-13x+5)

=7-6x²+13x-5

=-6x²+13x+2

d,3x(4x-3)+(2x-1)(6x+5)

=12x²-9x+12x²+10x-6x-5

=24x²-5x-5

e,2(3x-1)(2x+5)-(4x-1)(3x-2)

=2(6x²+15x-2x-5)-(12x²-8x-3x+2)

=2(6x²+13x-5)-(12x²-11x+2)

=12x²+26x-10-12x²+11x-2

=37x-12