-7|x+4|=21:(-3) giúp mình với ạ, cảm ơn
a)1/2-(x+1/3)=5/6
b)3/4-(x+1/2)=4/5
c)3/35-(3/5+x)=2/7
d)2/3.x=4/27
e)-3/5.x=21/10
GIÚP MÌNH VỚI Ạ. MÌNH CẦN GẤP VÀO SÁNG MAI. CẢM ƠN MỌI NGƯỜI!
a) \(\dfrac{1}{2}-\left(x+\dfrac{1}{3}\right)=\dfrac{5}{6}\)
\(\Rightarrow x+\dfrac{1}{3}=\dfrac{1}{2}-\dfrac{5}{6}\)
\(\Rightarrow x+\dfrac{1}{3}=\dfrac{-1}{3}\)
\(\Rightarrow x=\dfrac{-1}{3}-\dfrac{1}{3}\)
\(\Rightarrow x=\dfrac{-2}{3}\)
b)\(\dfrac{3}{4}-\left(x+\dfrac{1}{2}\right)=\dfrac{4}{5}\)
\(\Rightarrow x+\dfrac{1}{2}=\dfrac{3}{4}-\dfrac{4}{5}\)
\(\Rightarrow x+\dfrac{1}{2}=\dfrac{-1}{20}\)
\(\Rightarrow x=\dfrac{-1}{20}-\dfrac{1}{2}\)
\(\Rightarrow x=\dfrac{-11}{20}\)
c) \(\dfrac{3}{35}-\left(\dfrac{3}{5}+x\right)=\dfrac{2}{7}\)
\(\Rightarrow\dfrac{3}{5}+x=\dfrac{3}{35}-\dfrac{2}{7}\)
\(\Rightarrow\dfrac{3}{5}+x=\dfrac{-1}{5}\)
\(\Rightarrow x=\dfrac{-1}{5}-\dfrac{3}{5}\)
\(\Rightarrow x=\dfrac{-4}{5}\)
d)\(\dfrac{2}{3}.x=\dfrac{4}{27}\)
\(\Rightarrow x=\dfrac{4}{27}:\dfrac{2}{3}\)
\(\Rightarrow x=\dfrac{2}{9}\)
e) \(\dfrac{-3}{5}.x=\dfrac{21}{10}\)
\(\Rightarrow x=\dfrac{21}{10}:\dfrac{-3}{5}\)
\(\Rightarrow x=\dfrac{-7}{2}\)
a)21/36 - -11/30
b)-4/8 + -3/10
c)7/12 - -9/20
d)-2/5+ -11/30
GIÚP MÌNH VỚI Ạ. MÌNH CẦN GẤP. CẢM ƠN MỌI NGƯỜI!
\(\dfrac{21}{36}-\left(-\dfrac{11}{30}\right)=\dfrac{7}{12}+\dfrac{11}{30}=\dfrac{7.5+11.2}{60}=\dfrac{57}{60}=\dfrac{19}{20}\\ ----\\\dfrac{-4}{8}+\left(-\dfrac{3}{10}\right)=\dfrac{-1}{2}-\dfrac{3}{10}=\dfrac{-1.5-3}{10}=\dfrac{-8}{10}=-\dfrac{4}{5}\\ ----\\ \dfrac{7}{12}-\left(-\dfrac{9}{20}\right)=\dfrac{7}{12}+\dfrac{9}{20}=\dfrac{7.5+9.3}{60}=\dfrac{62}{60}=\dfrac{31}{30}\\ ---\\ \dfrac{-2}{5}+\left(-\dfrac{11}{30}\right)=-\dfrac{2}{5}-\dfrac{11}{30}=\dfrac{-2.6-11}{30}=-\dfrac{29}{30}\)
GIÚP MÌNH VỚI Ạ!
a) 4/9 + 4/3x = 7/9
b) (5/2 - x).(-4/7) = 9/14
c) 3x + 3/4 = 2\(\frac{2}{3}\)
d) -5/6 - x = 7/12 + -1/3
CÁC BẠN NÀO GIÚP ĐƯỢC THÌ MIK CẢM ƠN Ạ !!!
a: =>4/3x=7/9-4/9=1/3
=>x=1/4
b: =>5/2-x=9/14:(-4/7)=-9/8
=>x=5/2+9/8=29/8
c: =>3x+3/4=8/3
=>3x=23/12
hay x=23/36
d: =>-5/6-x=7/12-4/12=3/12=1/4
=>x=-5/6-1/4=-10/12-3/12=-13/12
\(d,-\dfrac{5}{6}-x=\dfrac{7}{12}+\dfrac{-1}{3}\)
\(\Leftrightarrow-\dfrac{5}{6}-x=\dfrac{7}{12}+\dfrac{-4}{12}\)
\(\Leftrightarrow-\dfrac{5}{6}-x=\dfrac{1}{4}\)
\(\Leftrightarrow-x=-\dfrac{5}{6}-\dfrac{1}{4}\)
\(\Leftrightarrow-x=-\dfrac{13}{12}\)
\(\Leftrightarrow x=\dfrac{13}{12}\)
\(c,3x+\dfrac{3}{4}=2\dfrac{2}{3}\)
\(\Leftrightarrow3x+\dfrac{3}{4}=\dfrac{8}{3}\)
\(\Leftrightarrow3x=\dfrac{8}{3}-\dfrac{3}{4}\)
\(\Leftrightarrow3x=\dfrac{23}{12}\)
\(\Leftrightarrow x=\dfrac{23}{12}:3\)
\(\Leftrightarrow x=\dfrac{23}{36}\)
Giúp mình với ạ, giải chi tiết nhé !
Mình xin cảm ơn !
a/ \(\sqrt{25}\) - 3\(\sqrt{\dfrac{4}{9}}\)
b/ (2 - \(\dfrac{5}{3}\)) : (\(\dfrac{2}{7}\) + \(\dfrac{5}{21}\) - 1)
c/ 12,7 - 17,2 + 199,9 - 22,8 - 149,9
d/ (\(\dfrac{-1}{2}\))4 + |\(\dfrac{-2}{3}\)| - 20070
e/ 4(\(\dfrac{-1}{2}\))3 + |\(\dfrac{1}{2}\)| : 5
g/ 3 - (\(\dfrac{-6}{7}\))0 + \(\sqrt{9}\) : 2
h/ \(\dfrac{27}{23}\) + \(\dfrac{5}{21}\) - \(\dfrac{4}{23}\) + \(\dfrac{6}{21}\) + \(\dfrac{1}{2}\)
a, \(\sqrt{25}-3\sqrt{\dfrac{4}{9}}=5-3.\dfrac{2}{3}=3\)
b, \(\left(2-\dfrac{5}{3}\right):\left(\dfrac{2}{7}+\dfrac{5}{21}-1\right)\)
\(=\dfrac{1}{3}:\dfrac{6+5-21}{21}\)
\(=-\dfrac{1}{3}.\dfrac{21}{10}\)
\(=-\dfrac{7}{10}\)
Giúp mình với ạ, mình xin cảm ơn trước ạ !.
\(\dfrac{5}{21}\) + \(\dfrac{1}{2}\) - \(\dfrac{19}{23}\) + \(\dfrac{16}{21}\) - \(\dfrac{4}{23}\)
\(=\dfrac{5}{21}+\dfrac{16}{21}-\left(\dfrac{19}{23}+\dfrac{4}{23}\right)+\dfrac{1}{2}=\dfrac{1}{2}\)
a)-15/4:21/-10
b)-7/14:(-0,14)
c)(-11/15): 1 1/10
d)2 1/7 :1 1/14
GIÚP MÌNH VỚI Ạ. MÌNH CẦN GẤP. CẢM ƠN MỌI NGƯỜI NHIỀU!
a) \(\dfrac{-15}{4}:\dfrac{21}{-10}=\dfrac{-15}{4}.\dfrac{-10}{21}=\dfrac{25}{14}\)
b) \(\dfrac{-7}{14}:\left(-0,14\right)=\dfrac{-7}{14}.\dfrac{-50}{7}=\dfrac{25}{7}\)
c) \(\left(\dfrac{-11}{15}\right):1\dfrac{1}{10}=\dfrac{-11}{15}.\dfrac{10}{11}=\dfrac{-2}{3}\)
d) \(2\dfrac{1}{7}:1\dfrac{1}{14}=\dfrac{15}{7}.\dfrac{14}{15}=2\)
\(a.-\dfrac{15}{4}:\left(\dfrac{21}{-10}\right)\)
\(=-\dfrac{15}{4}\cdot\left(-\dfrac{10}{21}\right)\)
\(=\dfrac{25}{14}\)
\(b.-\dfrac{7}{14}:\left(-0,14\right)\)
\(=-\dfrac{1}{2}:\left(-\dfrac{7}{50}\right)\)
\(=\dfrac{25}{7}\)
\(c.\left(-\dfrac{11}{15}\right):\left(1\dfrac{1}{10}\right)\)
\(=\left(-\dfrac{11}{15}\right):\dfrac{11}{10}\)
\(=-\dfrac{2}{3}\)
\(d.\left(2\dfrac{1}{7}\right):\left(1\dfrac{1}{14}\right)\)
\(=\dfrac{15}{7}:\dfrac{15}{14}\)
\(=2\)
a) \(\dfrac{-15}{4}:\dfrac{21}{-10}=\dfrac{-15}{4}.\dfrac{-10}{21}=\dfrac{25}{14}\)
b) \(\dfrac{-7}{14}:\left(-0,14\right)=\dfrac{-7}{14}:\dfrac{-7}{50}=\dfrac{-7}{14}.\dfrac{50}{-7}=\dfrac{25}{7}\)
c) \(\dfrac{-11}{15}:1.\dfrac{1}{10}=\dfrac{-11}{15}.\dfrac{1}{10}=\dfrac{-11}{150}\)
d) \(\dfrac{21}{7}:1.\dfrac{1}{14}=3.\dfrac{1}{14}=\dfrac{3}{14}\)
\(\dfrac{x}{y}=\dfrac{21}{28}\) mọi người giúp mình với ạ. Mình cảm ơn !!!
x = 3
y = 4
vì 21 / 28 = 21 : 7 / 28 : 7 = 3 / 4
cái này là mình rút gọn
x = 7 và y =8 nha
21/32 : 7/16 x 4/9
Giúp em em cảm ơn ạ!
\(\dfrac{21}{32}:\dfrac{1}{16}.\dfrac{4}{9}\)
\(=\dfrac{21.16.4}{32.9}\)
\(=\dfrac{3.7.32.2}{32.3.3}\)
\(=\dfrac{14}{3}\)
a)(-0,25).4/17.(-3 5/21).(-7/12)
b) (-2/5).4/15+(-3/10).4/15
c)21-3 3/4:(3/8-1/6)
d) (-3/4+2/5):3/7+(3/5+-1/4):3/7
GIÚP MÌNH VỚI Ạ. MÌNH CẦN GẤP VÀO SÁNG NAY. CẢM ƯN NỌI NGƯỜI NHÌU!
CÔ NGUYỄN THỊ THƯƠNG HOÀI GIÚP EM VỚI Ạ
a) \(...=-\dfrac{1}{4}.\dfrac{4}{17}.\left(-\dfrac{63}{21}\right).\left(-\dfrac{7}{12}\right)\)
\(=-\dfrac{1}{17}.\dfrac{63}{21}.\dfrac{7}{12}\)
\(=-\dfrac{7}{68}\)
b) \(...=-\dfrac{2}{5}.\dfrac{4}{15}-\dfrac{3}{10}.\dfrac{4}{15}\)
\(=\dfrac{4}{15}\left(-\dfrac{2}{5}-\dfrac{3}{10}\right)\)
\(=\dfrac{4}{15}\left(-\dfrac{4}{10}-\dfrac{3}{10}\right)\)
\(=\dfrac{4}{15}.\left(-\dfrac{7}{10}\right)=-\dfrac{14}{75}\)
c) \(...=21-\dfrac{15}{4}:\left(\dfrac{9}{24}-\dfrac{4}{24}\right)\)
\(=21-\dfrac{15}{4}:\dfrac{5}{24}\)
\(=21-\dfrac{15}{4}.\dfrac{24}{5}\)
\(=21-3.6=3\)
d) \(...=\left(-\dfrac{3}{4}+\dfrac{2}{5}\right).\dfrac{7}{3}+\left(\dfrac{3}{5}-\dfrac{1}{4}\right).\dfrac{7}{3}\)
\(=\dfrac{7}{3}\left(-\dfrac{3}{4}+\dfrac{2}{5}+\dfrac{3}{5}-\dfrac{1}{4}\right)\)
\(=\dfrac{7}{3}\left(-\dfrac{3}{4}-\dfrac{1}{4}+\dfrac{2}{5}+\dfrac{3}{5}\right)\)
\(=\dfrac{7}{3}\left(-1+1\right)=0\)