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Lời giải:
\(\frac{15}{17}\times \frac{45}{33}-\frac{15}{17}\times \frac{12}{33}=\frac{15}{17}\times (\frac{45}{33}-\frac{12}{33})=\frac{15}{17}\times \frac{33}{33}=\frac{15}{17}\times 1=\frac{15}{17}\)
b. \(\dfrac{4.2.3.5.2.6.2.5.3}{4.3.4.5.6.4.5.6}=\dfrac{1}{4}\)
c. \(\dfrac{17.2.101.2005}{17.2.101.2.2005}=\dfrac{1}{2}\)
d. \(\dfrac{2.3.4.2.11.13.17}{3.11.4.4.17.13.2}=\dfrac{1}{2}\)
a)\(\dfrac{4\times6\times10\times12\times15}{4\times12\times5\times24\times30}=\dfrac{2}{2\times2\times2}=\dfrac{2}{8}=\dfrac{1}{4}\)
b)\(\dfrac{34\times101\times2005}{17\times202\times4010}=\dfrac{2}{2\times2}=\dfrac{2}{4}=\dfrac{1}{2}\)
c)\(\dfrac{6\times8\times11\times13\times17}{33\times16\times17\times26}=\dfrac{6}{3\times2\times2}=\dfrac{1}{2}\)
\(=\dfrac{15}{17}\left(\dfrac{45}{33}-\dfrac{12}{33}\right)=\dfrac{15}{17}\)
\(a,\frac{x}{17}=\frac{60}{204}\Rightarrow x=\frac{60.17}{204}=5\)
\(b.6+\frac{x}{33}=\frac{7}{11}\)
\(\Leftrightarrow\frac{x}{33}=-\frac{59}{11}\)
\(\Rightarrow x=\frac{-59.33}{11}=-177\)
\(c,12+\frac{x}{43-x}=\frac{2}{3}\)
\(\Leftrightarrow\frac{x}{43-x}=-\frac{34}{3}\)
\(\Leftrightarrow3x=-1462+34x\)
\(\Leftrightarrow-31x=-1462\)
\(\Leftrightarrow x=\frac{1462}{31}\)
\(d,1< \frac{6}{x}< 2\)
\(\Leftrightarrow\frac{1}{6}< x< \frac{1}{3}\)
Mình vẫn chưa hiểu , bạn giải theo kiểu lớp 4 được không?
Bài 1:
a: \(=\dfrac{21}{7}\cdot\dfrac{15}{45}\cdot\dfrac{9}{18}=3\cdot\dfrac{1}{3}\cdot\dfrac{1}{2}=\dfrac{1}{2}\)
b: \(=\dfrac{11}{33}\cdot\dfrac{24}{8\cdot12}\cdot\dfrac{27}{9}=\dfrac{24}{96}=\dfrac{1}{4}\)
15x27 > 4812 : 12 vì 405 > 401
13545 : 43 < 33 x 17 vì 315 < 561
15x27>4812:12
13545:43<33x17