475 : 5 + 25 : 5 =
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a 475 - ( 75 + 36 ) = 475 - 75 - 36
= 400 - 36
= 364
b 821 - 73 - 27 - 21
= ( 821 - 21 ) - ( 73 + 27 )
= 800 - 100
= 700
a ) 475 - ( 75 + 36 )
= 475 - ( 75 + 35 ) - 1
= ( 475 - 1 ) - 100
= 474 - 100 = 374
b ) 821 - 73 - 27 - 21
= ( 821 - 21 ) - ( 73 + 27 )
= 800 - 100
= 700
c ) \(\frac{37}{25}\div\frac{5}{4}\div\frac{74}{25}\)
\(=\frac{37\cdot2\cdot2\cdot25}{25\cdot5\cdot37\cdot2}\)
\(=\frac{2}{5}\)
475 : X + 120 : X - 195 : X = 25
(475 + 120 - 195) : X = 25
400 : X = 25
X = 400 : 25
X = 16
Vậy X = 16
\(475x13+5x475-18x45=475x\left(13+5\right)-18x45.\)
\(=475x18-18x45=18x\left(475-45\right)\)
\(=18x400=7200.\)
475 - x . 5 = 447 - x . 3
3x - 5x = - 475 + 447
- 2x = - 28
x = - 28 : ( - 2)
x = 14
A = \(\dfrac{1}{20}\) + \(\dfrac{2}{35}\) + \(\dfrac{3}{70}\) + \(\dfrac{4}{140}\) + \(\dfrac{5}{266}\) + \(\dfrac{6}{475}\)
A = \(\dfrac{1}{4\times5}\)+ \(\dfrac{2}{5\times7}\)+ \(\dfrac{3}{7\times10}\)+ \(\dfrac{4}{10\times14}\)+\(\dfrac{5}{14\times19}\)+\(\dfrac{6}{19\times25}\)
A = \(\dfrac{1}{4}\)-\(\dfrac{1}{5}\)+\(\dfrac{1}{5}\)-\(\dfrac{1}{7}\)+\(\dfrac{1}{7}\)-\(\dfrac{1}{10}\)+\(\dfrac{1}{10}\)+\(\dfrac{1}{10}\)-\(\dfrac{1}{14}\)+\(\dfrac{1}{14}\)-\(\dfrac{1}{19}\)+\(\dfrac{1}{19}\)-\(\dfrac{1}{25}\)
A = \(\dfrac{1}{4}\)-\(\dfrac{1}{25}\)
A = \(\dfrac{21}{100}\)
\(475:5+25:5\)
\(=95+5\)
\(=100\)
\(475:5+25:5=95+5=100\)