đỉnh (x+2)^2

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`x`²	`x`^□	log_□	√☐	^□√☐	≤	≥	□□	·	÷	`x`^◦	π
(☐)^′	`ddx`	∂∂`x`	∫	∫_□^□	lim	∑	∞	`θ`	(`f` ◦ `g`)	`f`(`x`)

☐²

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ddx

≥	≤	·	÷	`x`^◦	(☐)	\|☐\|	(`f` ◦ `g`)	`f`(`x`)	ln	`e`^☐
(☐)^′	∂∂`x`	∫_□^□	lim	∑	sin	cos	tan	cot	csc	sec

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khai triển (3a−9b)³

Solution

27a³−243a²b+729ab²−729b³

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(3a−9b)³

Áp dụng Công thức Lập phương Hoàn hảo: (a−b)³=a³−3a²b+3ab²−b³

(3a−9b)³=(3a)³−3(3a)²· 9b+3· 3a(9b)²−(9b)³

=(3a)³−3(3a)²· 9b+3· 3a(9b)²−(9b)³

Rút gọn (3a)³−3(3a)²· 9b+3· 3a(9b)²−(9b)³: 27a³−243a²b+729ab²−729b³

=27a³−243a²b+729ab²−729b³

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−▭▭	<	7	8	9	÷	`AC`
+▭▭	>	4	5	6	×	☐☐☐
×▭▭	(	1	2	3	−	`x`
▭ \|▭	)	.	0	=	+	`y`

đỉnh (x+2)^2

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