\(\dfrac{11}{11}\)+\(\dfrac{1}{22}\)=\(\dfrac{22}{22}\)+\(\dfrac{1}{22}\)=\(\dfrac{23}{22}\)
\(\left(-\dfrac{5}{11}+\dfrac{7}{22}-\dfrac{-4}{33}-\dfrac{5}{44}\right)\div\left(38\dfrac{1}{22}-39\dfrac{7}{22}\right)\)
\(\dfrac{-2}{11}+\dfrac{-1}{6}+\dfrac{52}{264}+\dfrac{3}{22}+\dfrac{5}{24}+\dfrac{-7}{8}\) giúp với nha
B5: Tính hợp lý:
a, \(\dfrac{11}{22}-\dfrac{3}{16}.\dfrac{8}{18}+\dfrac{1}{18}\)
b, \(\dfrac{5}{7}+\dfrac{3}{7}:4-\dfrac{8}{9}.\dfrac{-3}{4}\)
Giải đầy đủ pls
Bài 3
\(\dfrac{55}{23}+\dfrac{-22}{23}\le x\le\dfrac{1}{5}-\dfrac{-1}{6}+\dfrac{79}{30}\) có bao nhiêu số nguyên X thỏa mãn
A 1 B 2 C 3 D 4
Bài 4
Nếu \(\dfrac{-11}{12}< \dfrac{5}{x}< \dfrac{-11}{15}\) Thì x là bao nhiêu
A 5 B 6 C -5 D -6
Bài 5
\(M=\dfrac{1}{1\cdot2}+\dfrac{1}{2\cdot3}+\dfrac{1}{3\cdot4}+...+\dfrac{1}{99\cdot100}\)
A 1 B 2 C \(\dfrac{99}{100}\) D \(\dfrac{1}{100}\)
e. \(\dfrac{38}{133}\)và\(\dfrac{129}{344}\)
f. \(\dfrac{11}{54}\)và\(\dfrac{22}{37}\)
\(\left(\dfrac{3}{2}-\dfrac{5}{11}-\dfrac{3}{13}\right)\left(2x-x2\right)=\left(-\dfrac{3}{4}+\dfrac{5}{22}+\dfrac{3}{26}\right)\)
b) B= \(\dfrac{1}{10}\).\(\dfrac{4}{11}\)+\(\dfrac{1}{10}\).\(\dfrac{8}{11}\)-\(\dfrac{1}{10}\).\(\dfrac{1}{11}\)
Bài 1 : thực hiện các phép tính ( tính hợp lí nếu có thể ):
a ,\(\dfrac{7}{2}.\dfrac{8}{13}+\dfrac{8}{13}.\dfrac{-5}{2}+\dfrac{8}{13}\)
b , \(\dfrac{-5}{17}.\dfrac{-9}{23}+\dfrac{9}{23}.\dfrac{-22}{17}+11\dfrac{9}{23}\)
Bài 2 : tìm x , biết :
a , \(\dfrac{7}{8}+x=\dfrac{3}{5}\)
b , \(\dfrac{1}{3}:\left(2x-1\right)=\dfrac{-4}{24}\)
Giúp mình với:
a) A=\(\dfrac{1}{3}\)-\(\dfrac{3}{5}\)+\(\dfrac{5}{7}\)-\(\dfrac{7}{9}\)+\(\dfrac{9}{11}\)-\(\dfrac{11}{13}\)+\(\dfrac{13}{15}\)+\(\dfrac{11}{13}-\dfrac{9}{11}+\dfrac{7}{9}-\dfrac{5}{7}+\dfrac{3}{5}-\dfrac{1}{3}\)
b) B= \(\dfrac{1}{9.10}-\dfrac{1}{8.9}-\dfrac{1}{7.8}-...-\dfrac{1}{2.3}-\dfrac{1}{1.2}\)
