(1,0 điểm) Thực hiện phép tính: a) 13 21 .1 , 45 − 13 21 . 9 20 ;b) ( − 2 5 ) 4 : ( − 2 5 ) 2 + √ 4 − 0 , 25 .
Giải thích
Hướng dẫn giải
a) \(\frac{{13}}{{21}}.1,45 - \frac{{13}}{{21}}.\frac{9}{{20}}\) \( = \frac{{13}}{{21}}.\left( {1,45 - \frac{9}{{20}}} \right)\) \( = \frac{{13}}{{21}}.\left( {1,45 - 0,45} \right)\) \( = \frac{{13}}{{21}}.1\) \( = \frac{{13}}{{21}}\). | b) \({\left( { - \frac{2}{5}} \right)^4}:{\left( { - \frac{2}{5}} \right)^2} + \sqrt 4 - 0,25\) \( = {\left( { - \frac{2}{5}} \right)^2} + \sqrt {{2^2}} - 0,25\) \( = \frac{4}{{25}} + 2 - \frac{1}{4}\) \( = \frac{{16}}{{100}} + \frac{{200}}{{100}} - \frac{{25}}{{100}}\) \( = \frac{{191}}{{100}}.\) |