G = \(\left(\dfrac{1313}{1414}+\dfrac{10}{160}\right)-\left(\dfrac{130}{140}-\dfrac{1515}{1616}\right)\)
= \(\left(\dfrac{13}{14}+\dfrac{1}{16}\right)-\left(\dfrac{13}{14}-\dfrac{15}{16}\right)\)
= \(\dfrac{13}{14}+\dfrac{1}{16}-\dfrac{13}{14}+\dfrac{15}{16}\)
= \(\dfrac{1}{16}+\dfrac{15}{16}=1\)
thực hiện phép tính bằng cách hợp lý :
a/(-2013) . 2014 + 1007 .26
b/(1313/1414 + 10/160) - (130/140 - 1515/1616)
(\(\frac{1313}{1414}\)+\(\frac{10}{160}\))-(\(\frac{130}{140}\)-\(\frac{1515}{1616}\))
1)tính 1 cách hợp lí: a) A=\(\left(\frac{1313}{1414}+\frac{10}{160}\right)-\left(\frac{130}{140}+\frac{1515}{1616}\right)\)
b)B=\(\left(\frac{2^6.3^5-9^2.4^3}{4^3.9^2-3^4.8^2}\right)\)
2)Chứng minh rằng:C=\(\frac{1}{101}+\frac{1}{102}+\frac{1}{103}+...+\frac{1}{200}>\frac{7}{12}\)
So sánh: 1414+1515+1616+1717/1818+1919+2020+2121 va 2424/3636
\(\frac{1414+1515+1616+1717+1818+1919}{2020+2121+2222+2323+2424+2525}\)
tìm B B = (1 - 12) x (1 - 13) x (1 - 14 x (1 - 15) x .... x (1 - 12003) x (1 - 12004)
Câu 5 : A= 1212 +122122+ 123123+ 124124+ ....+122021122021+122022122022và B= 1313+1414+1515+17601760
a) Rút gọn A
b) So sánh A và B
Thực hiện phép tính:
\(\frac{1414+1515+1616+1717+1818+1919}{2020+2121+2222+2323+2424+2525}\)
(1414+1515+1616+1717+1818+1919) / (2020+2121+2222+2323+2424+2525)
giúp mình giải chi tiết với nhé
tks ạ
