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\(\frac{2}{7}\)x \(\left(\frac{707}{202}+\frac{707}{3030}+\frac{707}{4242}+\frac{707}{5656}+\frac{707}{7272}\right)\)
\(=\frac{2}{7}\)x \(\left(\frac{7}{2}+\frac{7}{30}+\frac{1}{6}+\frac{1}{8}+\frac{7}{72}\right)\)
\(=\frac{2}{7}\)x \(\left(\frac{1260}{360}+\frac{84}{360}+\frac{60}{360}+\frac{45}{360}+\frac{35}{360}\right)\)
\(=\frac{2}{7}\)x \(\frac{371}{90}=\frac{53}{45}\)
3636/4545+x=4848/1515
x=4848/1515-3636/4545
x=14544/4545-3636/4545
x=10908/4545
3535/5050-x=8/25
x=3535/5050-1616/5050
x=1919/5050
\(\frac{3131}{3535}=\frac{3131:101}{3535:101}=\frac{31}{35}\)
\(\frac{204204}{217217}=\frac{204204:1001}{217217:1001}=\frac{204}{217}\)
\(\frac{414141}{180180}=\frac{414141:273}{180180:273}=\frac{1517}{660}\)
\(\frac{171171171}{180180180}=\frac{171171171:9009009}{180180180:9009009}=\frac{19}{20}\)
( 3434/3535 + 3434/6363 + 3434/9999 ) × 55
= ( 34/35 + 34/63 + 34/99 ) × 55
= 34 × ( 1/35 + 1/63 + 1/99 ) × 55
= 34 × 3/55 × 55
= 102/55 × 55
= 102
Mình ko chắc lắm đâu nhá
Mình giải theo kiểu lớp 6 nhá !
=\(33.\left(\frac{34}{15}+\frac{34}{35}+\frac{34}{63}+\frac{34}{99}\right)\)
=\(33.\left[34.\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}+\frac{1}{99}\right)\right]\)
=\(33.\left[34.\left(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+\frac{1}{9.11}\right)\right]\)
=\(33.\left[34.\left(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}\right).\frac{1}{2}\right]\)
=\(33.\left[34\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+\frac{1}{9}-\frac{1}{11}\right).\frac{1}{2}\right]\)
=\(33.\left[34.\left(\frac{1}{3}-\frac{1}{11}\right).\frac{1}{2}\right]\)
=\(33.\left(34.\frac{8}{33}.\frac{1}{2}\right)\)
=\(33.\frac{136}{33}\)
=\(\frac{33.136}{33}\)(*)
=\(136\)
(Bạn có thể bỏ bước có dấu *)
x/2 + 2/3 nhân x + 3/4 nhân x = 23/12
x nhân (1/2+2/3+3/4) = 23/12
x nhân 23/12 = 23/12
x = 23/12 : 23/12
x = 1
Vậy x = 1
Tk mk nha
\(\frac{3}{8}.x=4\)
\(\Rightarrow x=4:\frac{3}{8}\)
\(\Rightarrow4.\frac{8}{3}\)
\(\Rightarrow\frac{32}{3}\)
Chúc bạn học giỏi nha!!!
K mik mik k lại
Ta có : \(\frac{1717}{808}\)= \(\frac{17}{8}\)= \(\frac{119}{56}\)và \(\frac{1313}{707}\)=\(\frac{13}{7}\)=\(\frac{104}{56}\)
Vậy \(\frac{1717}{808}\)=\(\frac{1313}{707}\)
x = 4242