Question

giải giúp mk bài này nhé ( viết đầy đủ luôn) 

a, (x + 4)^3

b, (2x - 5)^2

c, (3x - 2x)^2 

câu cuối xíu nữa đăng 

Answer 1

\(\left(x+4\right)^3=x^3+12x^2+48x+64\)

\(\left(2x-5\right)^2=4x^2-20x+25\)

\(\left(3x-2x\right)^2=9x^2-12x^2+4x^2=x^2\)( đề lạ )

Answer 2

có gì lạ đâu

Answer 3

a/

\(\left(x+4\right)^3=x^3+4^3=x^3+64.\)

b/

\(\left(2x-5\right)^2=2x^2-5^2=2x^2-25\)

c/

\(\left(3x-2x\right)^2=x1^2\)

Answer 4

\(a,\)

\(\left(x+4\right)^3=x^2+12.x^2+48x+4^3\)

\(b,\)

\(\left(2x-5\right)^2=4x^2-20x+5^2\)

\(c,\)

\(\left(3x-2x\right)^2=9x^2-12x^2+4x^2\)

Answer 5

A) (x+4)^3=(x^3+3x^2*4+3x4^2+4^3 B)(2x-5)^2=(2x)^2-2*2x*5+5 ^2 C)(3x-2x)^2=(3x)^2-2*3x*2x+(2x)^2

Answer 6

\(a,\left(x+4\right)^3=x^3+3.x^2.4+3.x.4^2+64=x^3+12x^2+48x+64\)

\(b,\left(2x-5\right)^2=4x^2-20x+25\)

\(c,\left(3x-2x\right)^2=x^2\)

Answer 7

a) ( x + 4 )³

= x³ + 12x² + 48x + 64

b) ( 2x - 5 )²

= 4x² - 20x + 25

c) ( 3x - 2x )²

= 9x² - 12x² + 4x²

Answer 8

a, (x + 4 ) ^3 = x^3 + 3.x^2.4+3.x.4^2+4^3

                     = x^3 + 12x^2 + 12x^2 +4^3

                     = x^3 + (12x^2 + 12x^2) + 4^3

                     = x^3 + 24x^2 + 4^3

b, (2x - 5)^2 = (2x)^2 - 2.2x.5 + 5^2

                    = 4x^2 - 20x + 25

c, (3x - 2x)^2 = (3x)^2 - 2.3x.2x+(2x)^2

                      = 6x^2 - 12x^2 + 4x^2

                      = -2x^2

. là nhân nha