4x5x6/12x15x19
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`(4xx5xx6)/(12xx8xx10)=(4xx5xx6)/(6xx2xx4xx2xx5xx2)= 1/(2xx2xx2)=1/8`
4 x 5 x 6
= 20 x 6
= 120
12 x 8 x 88
= 96 x 88
= 8448
Chúc bạn may mắn nah!!!
5*6*7*9/12*7*27
=5*6*7*3*2/2*6*7*3*3
=5*1*1*1*1/1*1*1*1*3
=5/3
\(\frac{4\times5\times6}{12\times15\times9}\)\(=\frac{2\times2\times5\times6}{2\times6\times3\times5\times9}\)\(=\frac{2}{3\times9}\)\(=\frac{2}{27}\)
\(\frac{6\times8\times11}{33\times16}\)\(=\frac{2\times3\times8\times11}{3\times11\times8\times2}\)\(=\)\(1\)
~ HOK TỐT ~
\(\frac{2}{1.2.3}+\frac{2}{2.3.4}+...+\frac{2}{6.7.8}\)
\(=\frac{1}{1.2}-\frac{1}{2.3}+\frac{1}{2.3}-\frac{1}{3.4}+...+\frac{1}{6.7}-\frac{1}{7.8}\)
\(=\frac{1}{1.2}-\frac{1}{7.8}\)
\(=\frac{1}{2}-\frac{1}{56}\)
\(=\frac{28}{56}-\frac{1}{56}=\frac{27}{56}\)
Dấu . là nhân nha
\(\frac{2}{1.2.3}=\frac{1}{1.2}-\frac{1}{2.3}\)
\(\frac{2}{2.3.4}=\frac{1}{2.3}-\frac{1}{3.4}\)
.......................................
\(\frac{2}{6.7.8}=\frac{1}{6.7}-\frac{1}{7.8}\)
S= \(\frac{1}{1.2}-\frac{1}{7.8}=\frac{27}{56}\)
\(4\times5\times\dfrac{6}{12}\times15\times19\)
\(=2850\)
\(\dfrac{4\cdot5\cdot6}{12\cdot15\cdot19}=\dfrac{4}{12}\cdot\dfrac{5}{15}\cdot\dfrac{6}{19}=\dfrac{6}{19}\cdot\dfrac{1}{3}\cdot\dfrac{1}{3}\)
\(=\dfrac{2}{19}\cdot\dfrac{1}{3}=\dfrac{2}{57}\)