Câu 1 : [tex]A=2021-\frac{5}{3}-\frac{5}{6}-\frac{5}{10}-\frac{5}{15}-\frac{5}{21}-\frac{5}{28}-\frac{5}{36}-\frac{5}{45}[/tex]
Câu 2 : [tex]B=\frac{2^{12}.5^{7}+4^{6}.25^{3}}{8^{5}.25^{3}+20^{6}}[/tex]
Mong mọi người trợ giúp.Thanks
Bạn tham khảo
Câu 1 :[tex]A=2021-\frac{5}{3}-\frac{5}{6}-\frac{5}{10}-\frac{5}{15}-\frac{5}{21}-\frac{5}{28}-\frac{5}{36}-\frac{5}{45}[/tex]
[tex]\Rightarrow A=2021\left ( \frac{10}{6}+\frac{10}{12}+\frac{10}{20}+\frac{10}{30}+\frac{10}{42}+\frac{10}{56}+\frac{10}{72}+\frac{10}{90} \right )[/tex]
[tex]\Rightarrow A=2021 - 10\left ( \frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90} \right )[/tex]
[tex]\Rightarrow A=2021-10\left ( \frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10} \right )[/tex]
Đến đây bạn tự làm tiếp nhé.
Câu 2 : [tex]B=\frac{2^{12}.5^{7}+4^{6}.25^{3}}{8^{5}.25^{3}+20^{6}}[/tex]
[tex]\Rightarrow B=\frac{2^{12}.5^{7}+\left ( 2^{2}\right )^{6}.5^{6}}{2^{5}.5^{6}+\left ( 2^{2} \right )^{6}.5^{6}}[/tex]
[tex]\Rightarrow B=\frac{2^{12}.5^{7}+2^{12}.5^{6}}{2^{12}.2^{3}.5^{6}+2^{12}.5^{6}}[/tex]
[tex]\Rightarrow B=\frac{2^{12}.5^{6}\left ( 5+1 \right )}{2^{12}.5^{6}\left ( 2+1 \right )}[/tex]
Bạn tự làm tiếp nhé
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