a)     \(\begin{array}{l}{(x - 3)^4} = {x^4} + 4{x^3}.( - 3) + 6{x^2}.{( - 3)^2} + 4x.{( - 3)^3} + {( - 3)^4}\\ = {x^4} - 12{x^3} + 54{x^2} - 108x + 81\end{array}\)

b) \({(3x - 2y)^4} = 81{x^4} - 216{x^3}y + 216{x^2}{y^2} - 96x{y^3} + 16{y^4}\)

c)  

\(\begin{array}{l}{(x + 5)^4} + {(x - 5)^4} = {x^4} + 20{x^3} + 150{x^2} + 500x + 625\\ + {x^4} - 20{x^3} + 150{x^2} - 500x + 625\\ = 2{x^4} + 300{x^2} + 1250\end{array}\)

d)    \({(x - 2y)^5} = {x^5} - 10{x^4}y + 40{x^3}{y^2} - 80{x^2}{y^3} + 80x{y^4} - 32{y^5}\)

a) \({\left( {x - 2} \right)^4}\)

\(\begin{array}{l} = {x^4} + 4{x^3}.\left( { - 2} \right) + 6{x^2}.{\left( { - 2} \right)^2} + 4x{\left( { - 2} \right)^3} + {\left( { - 2} \right)^4}\\ = {x^4} - 8{x^3} + 24{x^2} - 32x + 16\end{array}\)

b) \({\left( {x + 2y} \right)^5}\)

\(\begin{array}{l} = {x^5} + 5.{x^4}.\left( {2y} \right) + 10.{x^3}.{\left( {2y} \right)^2} + 10.{x^2}.{\left( {2y} \right)^3} + 5.x.{\left( {2y} \right)^4} + 1.{\left( {2y} \right)^5}\\ = {x^5} + 10{x^4}y + 40{x^3}{y^3} + 80{x^2}{y^3} + 80x{y^4} + 32{y^5}\end{array}\)

x^5 + 5.x^4.2y + 10.x^3.4y^2 + 10.x^2.8y^3 + 5.x.16y^4 + 32y^5

= x^5 + 10.x^4.y + 40.x^3.y^2 + 80.x^2.y^3 + 80.x.y^4 +32.y^5

b) ( x - √7y )² = x² - 2x.7y + ( √7y )² 

= x² - 14xy + 7y

\((x-2y)^2\\=x^2-2\cdot x\cdot2y+(2y)^2\\=x^2-4xy+4y^2\)

15/ Mũ 4=> có 4+1=5 số hạng=> số hạng chính giữa là: \(C^2_4.3^{4-2}.x^2.2^2y^2=58x^2y^2\)

18/ \(x.x^k=x^7\Rightarrow k=6\)

\(C^6_9.3^6.2^3=489888\)

19/ \(C^7_7+C^7_8.\left(-1\right)^7+C^7_9.2^2=...\)