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\(\frac{1}{2\cdot x}-2021-\frac{1}{4}-\frac{1}{12}-\frac{1}{24}-...-\frac{1}{222}=\frac{6}{11}\)
\(\frac{1}{2\cdot x}-2021-\left(\frac{1}{4}+\frac{1}{12}+\frac{1}{24}+...+\frac{1}{222}\right)=\frac{6}{11}\)
....
Cái dãy \(\frac{1}{4}+\frac{1}{12}+\frac{1}{24}+...+\frac{1}{222}\) nó không có quy luật, không tính được
Sửa đề\(\frac{1}{2x-2021}-\frac{1}{4}-\frac{1}{12}-\frac{1}{24}-...-\frac{1}{220}=\frac{6}{11}\)
=> \(\frac{1}{2x-2021}-\left(\frac{1}{4}+\frac{1}{12}+\frac{1}{24}+...+\frac{1}{220}\right)=\frac{6}{11}\)
=> \(\frac{1}{2x-2021}-\frac{1}{2}\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{110}\right)=\frac{6}{11}\)
=> \(\frac{1}{2x-2021}-\frac{1}{2}\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{10.11}\right)=\frac{6}{11}\)
=> \(\frac{1}{2x-2021}-\frac{1}{2}\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+..+\frac{1}{10}-\frac{1}{11}\right)=\frac{6}{11}\)
=> \(\frac{1}{2x-2021}-\frac{1}{2}\left(1-\frac{1}{11}\right)=\frac{6}{11}\)
=> \(\frac{1}{2x-2021}-\frac{1}{2}.\frac{10}{11}=\frac{6}{11}\)
=> \(\frac{1}{2x-2021}-\frac{5}{11}=\frac{6}{11}\)
=> \(\frac{1}{2x-2021}=1\)
=> 2x - 2021 = 1
=> 2x = 2022
=> x = 1011
Vậy x = 1011
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`# \text {04th5}`
`a)`
\(7 \dfrac{3}{5} \div x = 5 \dfrac{4}{15} - 1 \dfrac{1}{6}\)
\(\Rightarrow 7 \dfrac{3}{5} \div x = \dfrac{41}{10}\)
\(\Rightarrow x = 7\dfrac{3}{5} \div \dfrac{41}{10}\)
\(\Rightarrow x = \dfrac{76}{41}\)
Vậy, $x = \dfrac{76}{41}$
`b)`
$x \times 2 \dfrac{2}{3} = 3 \dfrac{4}{8} + 6 \dfrac{5}{12}$
$\Rightarrow x \times \dfrac{2}{3} = \dfrac{119}{12}$
$\Rightarrow x = \dfrac{119}{12} \div \dfrac{2}{3}$
$\Rightarrow x = \dfrac{119}{8}$
Vậy, $x = \dfrac{119}{8}.$
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135256435 + 528536625 = 663793060
k minh nhe minh tra loi nhanh nhat . chuc ban hoc gioi
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\(\overline{abcd}+4707=\overline{bcda}\)
\(\Rightarrow1000xa+\overline{bcd}+4707=10x\overline{bcd}+a\)
\(\Rightarrow999xa+4707=9x\overline{bcd}\)
\(\Rightarrow111xa+523=\overline{bcd}\)
Ta có \(\overline{bcd}\le999\Rightarrow111xa+523\le999\Rightarrow111xa\le999-523=476\)
\(\Rightarrow a\le4\)
+ Với \(a=0\Rightarrow\overline{bcd}=523\)
+ Với \(a=1\Rightarrow\overline{bcd}=111+523=634\)
+ Với \(a=2\Rightarrow\overline{bcd}=222+523=745\)
+ Với \(a=3\Rightarrow\overline{bcd}=333+523=856\)
+ Với \(a=4\Rightarrow\overline{bcd}=444+523=967\)
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Gọi số đó là a ta có:
3698/a dư 26
736 /a dư 56
=>3698-26 chia hết cho a
736 -56 chia hết cho a
=>3673 chc a
680 chc a
=>3673+680 chc a
=>4353 chc a
tìm số nhanh kẻo muộn giờ đó bạn
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có tinh mấy bài hình học với cộng trừ gì gì đấy i !!!!!!!!!k nha
cho mik biết lớp 5 nha bài 1 là gì 2 là gì 3 là gì còn nhớ câu nào gửi cho mik mik k lun nhưng phải kt đã
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\(\left(123\text{ ×}0,25+123\text{ ×}0,75\right)\text{ ×}\left(11\text{ ×}9-900\text{ ×}0,1-9\right)\)
\(=\left(123\text{×}0,25+123\text{×}0,75\right)\text{ ×}\left(11\text{×}9-9\text{×}100\text{×}0,1-9\text{×}1\right)\)
\(=\left(123\text{×}0,25+123\text{×}0,75\right)\text{ ×}\left(11\text{×}9-9\text{×}10-9\text{×}1\right)\)
\(=\left[123\left(0,25+0,75\right)\right]\text{×}\left[9\text{×}\left(11-10-1\right)\right]\)
\(=\left(123\text{×}1\right)\text{×}\left(9\text{×}0\right)=123\text{×}0=0\)
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287 - ( y +34 ) :3 = 67
<=> ( y +34) : 3 = 287 - 67
<=> ( y +34) : 3 = 220
<=> y + 34 = 220 x 3
<=> y +34 = 660
<=> y = 660 - 34
<=> y = 626
3276 - 379 + 736 - 222
= 2897 + 736 - 222
= 3633 - 222
= 3411
/HT\
3276 - 379 + 736 - 222
=2897 + 763 - 222
=3633 - 222
=3411