Tìm X biết: a). X - 1313/2424 = 1717/3434
B). X - 4545/5454 = 1313/3939
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\(\frac{12}{36}=\frac{1}{3}\) ; \(\frac{75}{300}=\frac{1}{4}\) ; \(\frac{1313}{1717}=\frac{13}{17}\) ; \(\frac{1515}{2424}=\frac{15}{24}\); \(\frac{121}{1111}=\frac{11}{101}\) \(\frac{303}{3003}=\frac{101}{1001}\)
a,X=1020
b,X=20736
c,d, tự làm
\(\frac{1}{3};\frac{1}{4};\frac{11}{101};\frac{13}{17};\frac{101}{1001};\frac{5}{8}\)
\(=\dfrac{13}{17}\cdot\dfrac{17}{19}\cdot\dfrac{19}{13}=1\)
17 \(\times\) ( \(\dfrac{1313}{5151}\) + \(\dfrac{1111}{3434}\)) : \(\dfrac{117}{512}\)
= 17 \(\times\) ( \(\dfrac{1313:101}{5151:101}\) + \(\dfrac{1111:101}{3434:101}\)) : \(\dfrac{117}{512}\)
= 17 \(\times\) ( \(\dfrac{13}{51}\) + \(\dfrac{11}{34}\)): \(\dfrac{117}{512}\)
= 17 \(\times\) \(\dfrac{59}{102}\) \(\times\) \(\dfrac{512}{117}\)
= \(\dfrac{1003}{102}\) \(\times\) \(\dfrac{512}{117}\)
= \(\dfrac{15104}{351}\)
\(\frac{121212}{141414}\times\frac{1313}{1212}\times\frac{2424}{2424}\)
\(=\frac{6}{7}\times\frac{13}{12}\times1\)
\(=\frac{13}{14}\)
~ Hok tốt ~
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
\(\dfrac{1313}{1717}\) : \(\dfrac{1}{5}\) = \(\dfrac{13}{17}\) : \(\dfrac{1}{5}\) = \(\dfrac{65}{17}\)
a850/816
b2457/2106