\(C=\dfrac{1\dfrac{1}{2}+0,6-\dfrac{3}{7}}{2,5+1-\dfrac{35}{49}}=\dfrac{\dfrac{3}{2}+\dfrac{3}{5}-\dfrac{3}{7}}{\dfrac{5}{2}+\dfrac{5}{5}-\dfrac{5}{7}}=\dfrac{3\left(\dfrac{1}{2}+\dfrac{1}{5}-\dfrac{1}{7}\right)}{5\left(\dfrac{1}{2}+\dfrac{1}{5}-\dfrac{1}{7}\right)}=\dfrac{3}{5}\)
1.Tính hợp lí
a) \(0,7+\dfrac{-7}{19}-\left(-0,3\right)\)
b) \(\dfrac{5}{3}.\left(-2,5\right):\dfrac{5}{6}\)
c) \(0,6.\dfrac{-5}{17}-\dfrac{3}{5}.\dfrac{12}{17}\)
d) \(\dfrac{7}{4}.\dfrac{5}{2}-\dfrac{7}{4}.\dfrac{3}{2}\)
Giúp tui với!
\(25\%.\dfrac{-3}{5}-\dfrac{7}{5}.\dfrac{1}{4}+2\dfrac{1}{2}.0,2\)
ai giải được mình kết bạn
\(\dfrac{7}{1\cdot2}+\dfrac{7}{2\cdot3}+\dfrac{7}{3\cdot4}+...+\dfrac{7}{99\cdot100}\)
giúp mình với mai mình phải nộp rùi!!
a) 0,25-\(\dfrac{2}{3}\)+1\(\dfrac{1}{4}\)
b) \(\dfrac{3^2}{2}\):\(\dfrac{1}{4}\)+\(\dfrac{3}{4}\).2010
c) {[(\(\dfrac{1}{25}\)-0,6)2:\(\dfrac{49}{125}\)].\(\dfrac{5}{6}\)}-[(\(\dfrac{-1}{3}\))+\(\dfrac{1}{2}\)]
d) (-\(\dfrac{1}{2}\)-\(\dfrac{1^{ }}{3}\))2:[(\(\dfrac{-5}{36}\))-(\(\dfrac{-5}{36}\))0]
Mn giúp mk nhé mk gấp quá tí đi học ai làm được mk thả tim và like nhé
\(\dfrac{5}{9}\):\(\dfrac{13}{7}\)+\(\dfrac{5}{9}\):\(\dfrac{13}{9}\)-1\(\dfrac{2}{3}\)
4\(\dfrac{2}{5}\):0,5%-1\(\dfrac{3}{7}\).14%+(-0,5)
Tính giúp mik với!!! Mình cảm ơn
\(C=\)\(\dfrac{-5}{7}+\dfrac{3}{4}+\dfrac{-1}{5}+\dfrac{-2}{7}+\dfrac{1}{4}\)
GIẢI CHI TIẾT HỘ MÌNH VỚI!!!MÌNH CẦN GẤP!!!!! MÌNH CẢM ƠN NHIỀU Ạ!!!!
\(\dfrac{x-1}{21}=\dfrac{3}{x+1}\)
\(2\dfrac{1}{2}x+x=2\dfrac{1}{17}\)
\(\left(x+\dfrac{1}{4}-\dfrac{2}{3}\right):\left(2+\dfrac{1}{6}-\dfrac{1}{4}\right)=\dfrac{7}{46}\)
\(2\dfrac{1}{3}x-1\dfrac{3}{4}x+2\dfrac{2}{3}=3\dfrac{3}{5}\)
Giúp mình với ! Mình cần gấp
\(\dfrac{3}{15}.\dfrac{5}{9}:\dfrac{-18}{17}.\dfrac{14}{17}\)
\(\dfrac{12}{7}.\dfrac{7}{4}+\dfrac{35}{11}:\dfrac{245}{121}\)
giúp mình với
\(\dfrac{3}{15}.\dfrac{5}{9}:\dfrac{-18}{17}.\dfrac{14}{17}\)
\(\dfrac{12}{7}.\dfrac{7}{4}+\dfrac{35}{11}:\dfrac{245}{121}\)
giúp mình với
