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\(\frac{3434}{7171}+x=\frac{1234}{2468}\)
\(\frac{34}{71}+x=\frac{1}{2}\)
\(x=\frac{1}{2}-\frac{34}{71}\)
\(x=\frac{3}{142}\)
\(\overline{abc}\times9=\overline{1abc}\Leftrightarrow9\overline{abc}=1000+\overline{abc}\Leftrightarrow8\overline{abc}=1000\Leftrightarrow\overline{abc}=125.\)
abc x 9 = 1abc
abc x 9 = 1000 + abc
abc x 9 - abc = 1000
abc x ( 9-1 ) = 1000
abc x 8 = 1000
abc = 1000 : 8
abc = 125
=>3/6+4/6<x<16/4-5/4 K NHA MOI NGUOI
=>7/6<x<11/4
=>28/24<x<66/24
=>x=48/24=2
a.
x + 4/5 = 4/5 + 36/35
x + 4/5 = 64/35
x = 64/35 - 4/5
x = ......
b.
5/7 + x/35 = 4/5
Ta có :
25/35 + x/35 = 28/35
Suy ra x = 28 - 25
x = 3
x0x03 + x030x + 30x0x = 111111
x0x00 + 3 + x000x + 300 + x0x + 30000 = 111111
30303 + x . 10100 + x . 10001 + x . 101 = 111111
30303 + x . ( 10100 + 10001 + 101 ) = 111111
30303 + x . 20202 = 111111
x . 20203 = 111111 - 30303
x . 20203 = 80808
x = 80808 : 20202
x = 4
x = 4
( . là dấu nhân)
\(\frac{4}{7}< \frac{x}{10}< \frac{5}{7}\)
\(\frac{40}{70}< \frac{7x}{70}< \frac{50}{70}\)
\(\Rightarrow7x=49;56\)
\(\Rightarrow x=7;8\)
\(\frac{3434}{7171}\) + \(x\) = \(\frac{1234}{2468}\)
\(\frac{34}{71}\) + \(x\) = \(\frac12\)
\(x\) = \(\frac12\) - \(\frac{34}{71}\)
\(x\) = \(\frac{71}{142}\) - \(\frac{68}{142}\)
\(x\) = \(\frac{3}{142}\)
71713434 + \(x\) = \(\frac{1234}{2468}\)
\(\frac{34}{71}\) + \(x\) = \(\frac{1}{2}\)
\(x\) = \(\frac{1}{2}\) - \(\frac{34}{71}\)
\(x\) = \(\frac{71}{142}\) - \(\frac{68}{142}\)
\(x\) = \(\frac{3}{142}\)