3/2-(x+1/2)=4/5
giúp mình nhé
cảm ơn...........................
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NN
2
18 tháng 4 2021
Giải:
B=1,4 .15/49 - (4/5+2/3) :2 1/5
B=7/5.15/49 - 22/15 : 11/5
B=3/7 - 2/3
B=-5/21
Chúc bạn học tốt!
HM
0
K
9 tháng 3 2022
\(\dfrac{3}{5}+\dfrac{4}{3}\times\dfrac{5}{6}=\dfrac{3}{5}+\dfrac{10}{9}=\dfrac{27}{45}+\dfrac{50}{45}=\dfrac{77}{45}\)
\(2-\dfrac{7}{6}+\dfrac{1}{3}=\dfrac{12}{6}-\dfrac{7}{6}+\dfrac{2}{6}=\dfrac{7}{6}\)
\(\dfrac{7}{6}\times3-\dfrac{3}{5}=\dfrac{7}{2}-\dfrac{3}{5}=\dfrac{35}{10}-\dfrac{6}{10}=\dfrac{29}{10}\)
LQ
1
HT
5
NT
5
O
23 tháng 3 2022
a) \(\dfrac{3}{5}\times x=\dfrac{4}{7}\)
\(x=\dfrac{4}{7}\div\dfrac{3}{5}\)
\(x=\dfrac{20}{21}\)
b) \(\dfrac{1}{8}\div x=\dfrac{1}{5}\)
\(x=\dfrac{1}{8}\div\dfrac{1}{5}\)
\(x=\dfrac{5}{8}\)
17 tháng 2 2022
\(=\left(\dfrac{3+8}{12}\right)\cdot\dfrac{4}{5}=\dfrac{11}{12}\cdot\dfrac{4}{5}=\dfrac{44}{60}=\dfrac{11}{15}\)
AT
26 tháng 9 2021
a) -6 . (- \(\dfrac{2}{3}\) ) . 0,25 = 14 . 0,25 = 3,5
b) -\(\dfrac{15}{4}\) . ( - \(\dfrac{7}{15}\) ) . ( - \(\dfrac{22}{25}\) ) = \(\dfrac{7}{4}\) . ( - \(\dfrac{22}{25}\) ) = - \(\dfrac{77}{50}\) = - 1,54
c) -\(\dfrac{21}{5}\) . ( - \(\dfrac{9}{11}\) ) . ( - \(\dfrac{11}{14}\) ) . \(\dfrac{2}{5}\) = \(\dfrac{189}{55}\) . ( - \(\dfrac{11}{14}\) ) . \(\dfrac{2}{5}\) = - \(\dfrac{297}{110}\) . \(\dfrac{2}{5}\) = - \(\dfrac{297}{275}\)
\(\)
\(\frac{3}{2}-\left(x+\frac{1}{2}\right)=\frac{4}{5}\)
\(\left(x+\frac{1}{2}\right)=\frac{3}{2}-\frac{4}{5}\)
\(\left(x+\frac{1}{2}\right)=\frac{7}{10}\)
\(x=\frac{7}{10}-\frac{1}{2}\)
\(x=\frac{1}{5}\)
\(\frac{3}{2}-\left(x+\frac{1}{2}\right)=\frac{4}{5}\)
\(\left(x+\frac{1}{2}\right)=\frac{3}{2}-\frac{4}{5}\)
\(\left(x+\frac{1}{2}\right)=\frac{7}{10}\)
\(x=\frac{7}{10}-\frac{1}{2}=\frac{1}{5}\)