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Ta có: \(\dfrac{3344}{1212}\)
\(=\dfrac{3344:4}{1212:4}\)
\(=\dfrac{836}{303}\)
\(\frac{171717}{292929}=\frac{17\times10101}{29\times10101}=\frac{17}{29}\)\(\frac{1717}{2929}=\frac{17\times101}{29\times101}=\frac{17}{29}\) suy ra \(\frac{1717}{2929}=\frac{171717}{292929}\)
a ) − 1212 − 2424 = ( − 1212 ) : ( − 1212 ) ( − 2424 ) : ( − 1212 ) = 1 2
b ) 120120 − 240240 = 120120 : ( − 120120 ) − 240240 : ( − 120120 ) = − 1 2
c) 1313 − 1414 = 1313 : ( − 101 ) − 1414 : ( − 101 ) = − 13 14
a) 33 66 = 33 : 33 66 : 33 = 1 2 b ) − 22 77 = − 22 : 11 77 : 11 = − 2 7
c ) 3030 6060 = 3030 : 3030 6060 : 3030 = − 1 2 d ) − 1212 − 2424 = ( − 1212 ) : ( − 1212 ) ( − 2424 ) : ( − 1212 ) = 1 2
e ) 120120 − 240240 = 120120 : ( − 120120 ) − 240240 : ( − 120120 ) = − 1 2
f ) 1313 − 1414 = 1313 : ( − 101 ) − 1414 : ( − 101 ) = − 13 14
\(1,\)Rút gọn : \(\frac{-24}{56};\frac{1212}{-4545}\)
\(\frac{-24}{56}=\frac{-24:8}{56:8}=\frac{-3}{7}\)
\(\frac{1212}{-4545}=\frac{1212:(-101)}{(-4545):(-101)}=\frac{-12}{45}=\frac{-4}{15}\)
Tự so sánh
a) \(\frac{171717}{292929}=\frac{171717:10101}{292929:10101}=\frac{17}{29}\)
b) \(\frac{3344}{1212}=\frac{3344:4}{1212:4}=\frac{836}{303}\)
c) \(\frac{20192019}{20172017}=\frac{20192019:10001}{20172017:10001}=\frac{2019}{2017}\)
a) 17/29(chia cho 10101)
B) 836/303( chia 4)
C) 2019/2017(chia 10001)