Question

Tính:

a,(3+2x)^2

b,(3x-2y)^2

c,(2x-3y).(2x+3y)

d,(2x+3y)^3

Answer 1

a, \(\left(3+2x\right)^2=9+12x+4x^2\)

b, \(\left(3x-2y\right)^2=9x^2-12xy-4y^2\)

c, \(\left(2x-3y\right)\left(2x+3y\right)=4x^2+6xy-6xy-9y^2=4x^2-9y^2\)

d, \(\left(2x+3y\right)^3=8x^3+36x^2y+54xy^2+27y^3\)

Answer 2

( 3 + 2x )² = 3² + 2.3.2x + ( 2x )² = 4x² + 12x + 9

( 3x - 2y )² = ( 3x )² - 2.3x.2y + ( 2y )² = 9x² - 12xy + 4y²

( 2x - 3y )( 2x + 3y ) = ( 2x )² - ( 3y )² = 4x² - 9y²

( 2x + 3y )³ = ( 2x )³ + 3( 2x )².3y + 3.2x.( 3y )² + ( 3y )³ = 8x³ + 36x²y + 54xy² + 27y³

Answer 3

Khai triển HĐT ?

a) \(\left(3+2x\right)^2=9+12x+4x^2\)

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

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

d) \(\left(2x+3y\right)^3=8x^3+36x^2y+54xy^2+27y^3\)

Answer 4

                           Bài làm :

a) \(\left(3+2x\right)^2=9+12x+4x^2\)

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

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

d) \(\left(2x+3y\right)^3=8x^3+36x^2y+54xy^2+27y^3\)

Chúc bạn học tốt !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 5

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

b,\(\left(3x-2y\right)^2=9x^2-12xy+4y^2\)

c,\(\left(2x-3y\right)\left(2x+3y\right)=\left(2x\right)^2-\left(3y\right)^2=4x^2-9y^2\)

Answer 6

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

\(b,\left(3x-2y\right)^2=9x^2-12xy+4y^2\)

\(c,\left(2x-3y\right).\left(2x+3y\right)=4x^2-9y^2\)

\(d,\left(2x+3y\right)^3=8x^3+36x^2y+54xy^2+27y^3\)