\(A=\dfrac{4116-14}{10290-35}=\dfrac{14\times\left(294-1\right)}{35\times\left(294-1\right)}=\dfrac{14}{35}\)
\(B=\dfrac{2929-101}{2\times1919+404}=\dfrac{101\times\left(29-1\right)}{101\times\left(38+4\right)}=\dfrac{29-1}{38+4}=\dfrac{28}{32}=\dfrac{7}{8}\)
1.So Sánh
a) A=\(\dfrac{11}{2017}+\dfrac{4}{2019}và\) B=\(\dfrac{10}{2017}+\dfrac{10}{2019}\)
b) M=\(\dfrac{1}{5}+\dfrac{1}{12}+\dfrac{1}{13}+\dfrac{1}{14}+\dfrac{1}{30}+\dfrac{1}{61}+\dfrac{1}{62}và\dfrac{1}{2}\)
c) E=\(\dfrac{4116-14}{10290-35}và\) K=\(\dfrac{2929-101}{2.1919+404}\)
1,Rút gọn phân số :
a)\(\frac{-315}{540}\)
b)\(\frac{25.13}{26.35}\)
c)\(\frac{2929-101}{2.1919+404}\)
d)\(\frac{-1997.1996+1}{\left(-1995\right).\left(-1997\right)+1996}\)
cho :
\(\dfrac{\dfrac{2}{3}n+\dfrac{1}{5}\cdot\dfrac{3}{7}+\dfrac{1}{7}\cdot\dfrac{3}{10}+\dfrac{1}{3}n-\dfrac{1}{14}+\dfrac{33}{35}}{\dfrac{2}{3}\cdot\left(3n+\dfrac{3}{5}\right)\dfrac{14}{15}+\dfrac{1}{3}}\)
a, Hãy rút gọn A.
b,Tìm giá trị của A khi n =\(\dfrac{-1}{5}\)
c,Tìm n để A nhận giá trị là \(\dfrac{2}{5}\)
d,Tìm n để 2A thuộc Z
A=\(\dfrac{2}{3}+\dfrac{14}{15}+\dfrac{34}{35}+...+\dfrac{4056194}{4056195}+\left(-1006\right)\)
Tính A
Tìm x biết:
a) 2-\(\dfrac{14}{x}=\dfrac{-22}{3}\)
b) (\(\dfrac{2x}{5}+1\)):(-7)=\(\dfrac{1}{35}\)
Bài 1. tìm x, biết :
\(\dfrac{X}{2}+\dfrac{X}{14}+\dfrac{X}{35}+\dfrac{X}{65}+\dfrac{X}{104}+\dfrac{X}{209}=1\dfrac{3}{11}\)
Rút gọn rồi quy đồng mẫu các phân số sau
A = \(\dfrac{2483-13}{4966-26}\)
B = \(\dfrac{2727-101}{7575+303}\)
So sánh các phân số sau:
a)\(\dfrac{3}{124};\dfrac{1}{41};\dfrac{5}{207};\dfrac{2}{83}\)
b) \(\dfrac{27}{82};\dfrac{26}{75}\)
c) \(\dfrac{134}{43};\dfrac{55}{21};\dfrac{74}{19};\dfrac{116}{37}\)
d) \(\dfrac{-2525}{2929};\dfrac{-217}{245}\)
e) \(\dfrac{-49}{78};\dfrac{64}{-95}\)
a)\(\dfrac{2}{7}+\dfrac{-3}{8}+\dfrac{11}{7}+\dfrac{1}{7}_{ }+\dfrac{5}{-8}\)
b)\(\dfrac{3}{17}+\dfrac{-5}{13}+\dfrac{-18}{35}+\dfrac{14}{17}+\dfrac{17}{-35}_{ }+\dfrac{-8}{13}\)
c)\(\dfrac{-3}{8}+\dfrac{12}{25}+\dfrac{5}{-8}+\dfrac{2}{-5}+\dfrac{13}{25}\)
d)\(\dfrac{-5}{21}+\left(\dfrac{-16}{21}+1\right)\)
e)\(\dfrac{-3}{17}+\left(\dfrac{2}{3}+\dfrac{3}{17}\right)\)
f)\(\left(\dfrac{-1}{6}+\dfrac{5}{-12}\right)+\dfrac{7}{12}\)
