Tính 0,2(45)=245-1/900=244/900=62/225
dấu /là phân số đó nhé
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tính
a, A = \(\frac{3^6.4.5^4-15^{13}.5^{-3}}{27^4.25^3+45^6}\)
b , B = \(\frac{\left[\left(6,2:0,31-\frac{5}{6}.0,9\right).0,2+0,15\right]:0,2}{\left(2+1\frac{4}{11}.0,22:0,1\right).\frac{1}{33}}\)
a) \(\frac{5}{12}+\frac{5}{20}+\frac{5}{30}+...+\frac{5}{9900}\)
b) \(\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+...+\frac{89}{90}\)
c) \(\frac{7}{6}+\frac{13}{12}+\frac{21}{20}+...+\frac{91}{90}\)
d) \(\left(6-\frac{2}{3}+\frac{1}{2}\right)-\left(5+\frac{5}{3}-\frac{2}{3}\right)-\left(3-\frac{7}{3}+\frac{5}{2}\right)\)
$\frac{3}{2}+\frac{13}{6}+\frac{37}{12}+\frac{81}{20}+\frac{151}{30}+\frac{253}{42}+\frac{393}{56}+\frac{577}{72}+\frac{811}{90}$
tính
2,\(A=\frac{0,375-0,3+\frac{3}{11}+\frac{3}{12}}{-0,625+0,5-\frac{5}{11}-\frac{5}{12}}+\frac{1,5+1-0,75}{2,5+\frac{5}{3}-1,25}\)
3,\(B=\frac{\frac{1}{3}-\frac{1}{7}-\frac{1}{13}}{\frac{2}{3}-\frac{2}{7}-\frac{2}{13}}.\frac{\frac{1}{3}-0,25+0,2}{1\frac{1}{6}-0,875+0,7}+\frac{6}{7}\)
A=\(\frac{10-\frac{1}{9}-\frac{2}{10}-\frac{3}{11}-...-\frac{10}{18}}{\frac{1}{45}+\frac{1}{50}+\frac{1}{55}+...+\frac{1}{90}}\)
Tính
( 1 + 2 +3 +.....+ 90 ) ( 12 . 34 - 6 . 68 ) : (\(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6}\))
Dear thảo :))-1-frac{1}{3}-frac{1}{6}-frac{1}{10}-frac{1}{15}-...-frac{1}{45}-1-left(frac{1}{3}+frac{1}{6}+frac{1}{10}+...+frac{1}{45}right)-1-2.left(frac{1}{6}+frac{1}{12}+frac{1}{20}+...+frac{1}{90}right)-1-2.left(frac{1}{2.3}+frac{1}{3.4}+...+frac{1}{9.10}right)-1-2.left(frac{1}{2}-frac{1}{3}+frac{1}{3}-frac{1}{4}+...+frac{1}{9}-frac{1}{10}right)-1-2.left(frac{1}{2}-frac{1}{10}right)-1-2.frac{2}{5}frac{-9}{5}
Đọc tiếp
Dear thảo :))
\(-1-\frac{1}{3}-\frac{1}{6}-\frac{1}{10}-\frac{1}{15}-...-\frac{1}{45}\)
\(=-1-\left(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{1}{45}\right)\)
\(=-1-2.\left(\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{90}\right)\)
\(=-1-2.\left(\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{9.10}\right)\)
\(=-1-2.\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\right)\)
\(=-1-2.\left(\frac{1}{2}-\frac{1}{10}\right)\)
\(=-1-2.\frac{2}{5}\)
\(=\frac{-9}{5}\)
Tính bằng cách hợp lí:
a) \(\frac{15}{12}+\frac{5}{13}-\frac{3}{12}-\frac{18}{13}\) ( Phép này tính bằng 1 nhưng lại sai mất)
b) \(\frac{13}{25}+\frac{6}{41}-\frac{38}{25}+\frac{35}{41}-\frac{1}{2}\)
c) \(\left(\frac{1}{2}-\frac{2}{3}\right)-\left(\frac{5}{3}-\frac{3}{2}\right)+\left(\frac{7}{3}-\frac{5}{2}\right)\)
Help me!!!!! Nhanh nhé, 15' thui
Tính nhanh:
S=\(\frac{3}{4}-0,25-[\frac{7}{3}+(\frac{-9}{2})]-\frac{5}{6}\)
X=\(\frac{1}{90}-\frac{1}{72}-\frac{1}{56}-\frac{1}{42}-\frac{1}{30}-\frac{1}{20}-\frac{1}{12}-\frac{1}{6}-\frac{1}{2}\)