x-10=6

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

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

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sequence sum a₁=−2, d=3

Solution

3n²−7n2

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a₁=−2, d=3

Tìm kiểu của dãy đã cho a₁=−2, d=3: cấp số cộng: d=3, a_n=3n−5

Tìm tổng của dãy đã cho a₁=−2, d=3: S_n=3n²−7n2

=3n²−7n2

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sequence type a₁=−2, d=3

first term a₁=−2, d=3

nth term a₁=−2, d=3

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

x-10=6

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