Toán Lớp 5: tính bằng cách thuận tiện :
[ 1- 1/2 ] * [ 1- 1/3] * [1-1/4 ]* [ 1-1/5]
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Toán Lớp 5: tính bằng cách thuận tiện :
[ 1- 1/2 ] * [ 1- 1/3] * [1-1/4 ]* [ 1-1/5]
Comments ( 2 )
\left( {1 – \frac{1}{2}} \right).\left( {1 – \frac{1}{3}} \right).\left( {1 – \frac{1}{4}} \right).\left( {1 – \frac{1}{5}} \right)\\
= \left( {\frac{2}{2} – \frac{1}{2}} \right).\left( {\frac{3}{3} – \frac{1}{3}} \right).\left( {\frac{4}{4} – \frac{1}{4}} \right).\left( {\frac{5}{5} – \frac{1}{5}} \right)\\
= \frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}\\
= \frac{{1.2.3.4}}{{2.3.4.5}}\\
= \frac{1}{5}
\end{array}\]