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\(\frac{27.13-12}{24+37.12}\)
\(=\frac{351-12}{24+444}\)
\(=\frac{113}{156}\)
\(\frac{1}{2\cdot x}-2021-\frac{1}{4}-\frac{1}{12}-\frac{1}{24}-...-\frac{1}{222}=\frac{6}{11}\)
\(\frac{1}{2\cdot x}-2021-\left(\frac{1}{4}+\frac{1}{12}+\frac{1}{24}+...+\frac{1}{222}\right)=\frac{6}{11}\)
....
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
17,58 x 43 + 57 x 17,58
= 17,58 x ( 43 + 57 )
= 17,58 x 100
= 1758
0,25 x 12,44 + 15,89
= \(3,11+15,89\)rút gọn đó nha
= \(19\)nhớ k nha
\(13,5.1,3+1,7x=24,35\)
\(\Rightarrow17,55+1,7x=24,35\)
\(\Rightarrow1,7x=24,35-17,55\)
\(\Rightarrow1,7x=6,8\)
\(\Rightarrow x=\frac{6,8}{1,7}\)
\(\Rightarrow x=4\)
Vậy x =4.
Lời giải:
$=4,8\times (2,7+1,7)+5\times 47=4,8\times 4,4+5\times 47$
$=21,12+235=256,12$
(5x-24).73=2.7
5x - 24 = 14 : 73
5x = 14/73 + 24
5x = 1766/73
x= 1766/72 . 1/5
x= 1766/365