Tính:
17 13 ÷ 51 26
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\(\dfrac{33}{38}:\dfrac{11}{19}=\dfrac{33\times19}{38\times11}=\dfrac{3\times1}{2\times1}=\dfrac{3}{2}\)
\(\frac{22\cdot13\cdot17}{55\cdot26\cdot51}\)
\(=\frac{22\cdot13\cdot17}{55\cdot13\cdot2\cdot3\cdot17}\)
\(=\frac{11\cdot2}{55\cdot2\cdot3}\)
\(=\frac{11}{55\cdot3}=\frac{11}{165}\)
\(\frac{22.13.17}{55.26.51}\) = \(\frac{2.11.13.17}{11.5.13.2.17.3}\) = \(\frac{1}{15}\)
. là dấu nhân nhé
\(\frac{17}{13}\) : \(\frac{51}{26}\) = \(\frac{17}{13}\) x \(\frac{26}{51}\) = \(\frac{1}{2}\) x \(\frac{2}{3}\) = \(\frac{1}{3}\)
P/S : 17 mk rút gọn cho 51 còn 13 rút gọn cho 26 nha
17 : 17 = 1 ; 51 : 17 = 3 13 : 13 = 1 ; 26 : 13 = 2
Cách làm :
\(\frac{17}{13}:\frac{51}{26}\)
\(=\frac{17}{13}×\)\(\frac{26}{51}\)
\(=\frac{442}{663}=\frac{2}{3}\)
4/9 - 1/6 bằng 24/54 - 9/54 bằng 15
17/13 : 51/26 bằng 17/13 nhân 26/51 bằng 442/663
\(3\div\frac{1}{2}=3\times\frac{2}{1}=6\)
\(\frac{1}{2}\div3=\frac{1}{2}\times\frac{1}{3}=\frac{1}{6}\)
2.Tính theo mẫu :
b) \(\frac{6}{25}\div\frac{21}{20}=\frac{6}{25}\times\frac{20}{21}=\frac{6\times20}{25\times21}=\frac{2\times3\times4\times5}{5\times5\times3\times7}=\frac{8}{35}\)
\(\frac{40}{7}\times\frac{14}{5}=\frac{40\times14}{7\times5}=\frac{5\times8\times7\times2}{7\times5}=16\)
\(\frac{17}{13}\div\frac{51}{26}=\frac{17}{13}\times\frac{26}{51}=\frac{17\times13\times2}{13\times17\times3}=\frac{2}{3}\)
Chúc bạn hok tốt !
9: \(=\dfrac{47}{51}\cdot\dfrac{17}{94}-\dfrac{47}{51}\cdot\dfrac{53}{91}-\dfrac{53}{91}\cdot\dfrac{91}{53}+\dfrac{53}{91}\cdot\dfrac{47}{51}\)
\(=\dfrac{1}{6}-1=-\dfrac{5}{6}\)
10: \(=\dfrac{13}{19}\cdot\dfrac{19}{26}-\dfrac{13}{19}\cdot\dfrac{71}{43}+\dfrac{71}{43}\cdot\dfrac{13}{19}-\dfrac{71}{43}\cdot\dfrac{86}{71}\)
\(=\dfrac{1}{2}-2=-\dfrac{3}{2}\)