\(a.\left(x-2\right)^3=x^3-3.x^2.2+3.x.2^2-2^3=x^3-6x^2+12x-8\)

\(b.\left(x+3\right)^3=x^3+3.x^2.2+3.x.2^2+2^3=x^3+6x^2+12x+8\)

\(c.\left(2x+3\right)^2=\left(2x\right)^2+2.2x.3+3^2=4x^2+12x+9\)

\(d.\left(\dfrac{1}{2}.3y\right)^3+x-1=\left(\dfrac{3}{2}y\right)^3+x-1=\dfrac{27}{8}y+x-1\)

pn ơi bài 2 BD ở đâu vậy

a.Xét \(\Delta\perp BAO\) và \(\Delta\perp BPO\)

có \(\left\{{}\begin{matrix}\widehat{B_1}=\widehat{B_2}\left(BE là tia phân giác \widehat{B}\right)\\BO chung\end{matrix}\right.\)

\(\Rightarrow\Delta\perp BAO=\Delta\perp BPO\) (cạnh góc vuông- góc nhọn kề)

\(\Rightarrow BA=BP\) (2 cạnh tương ứng)

\(\Rightarrow\Delta ABP\) cân tại \(B\)

A = 1 + 2 + 2² + ... + 2¹⁰⁰

2A = 2 + 2² + ... + 2¹⁰¹

2A - A = 2¹⁰¹ - 1

A = 2¹⁰¹ - 1

=> 2⁵⁰ . ( 2¹⁰¹ - 1 + 1 ) = 2^m

=> 2⁵⁰.2¹⁰¹ = 2^m

=> 2¹⁵¹ = m

=> m = 151

JUNGKOOK pn viết đề cần rõ hơn nha. Có phải là:

Jess: When is / was glue first invented?

Jack: In 1750. The glue is / was made from fish!

đúng hok?

TL:

Jess: When was glue first invented?

Jack: In 1750. The glue was made from fish