Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
A) \(\frac{1}{2}\cdot\left(\frac{2}{9}+\frac{3}{7}-\frac{5}{27}\right)\)
\(=\frac{1}{2}\cdot\frac{1}{2}\)
\(=\frac{1}{4}\)
B) \(\left(\frac{-5}{28}+1.75+\frac{8}{35}\right):\left(-3\frac{9}{20}\right)\)
\(=\left(\frac{-5}{28}+\frac{7}{4}+\frac{8}{35}\right):\frac{-69}{20}\)
\(=\frac{14}{5}:\frac{-69}{20}\)
\(=\frac{-56}{69}\)
x-[17/2-6/35]=-1/3
x-583/70=-1/3
x=-1/3+583/70
x=1679/210
vậy x=1769/210
[2/3-(x-7/4)]=9/2+5/4
[2/3-(x-7/4)]=23/4
(x-7/4)=23/4+2/3
(x-7/4)=77/12
x=77/12+7/4
x=49/6
vậy x=49/6
=\(\frac{3}{4}-\frac{5}{2}-\frac{5}{3}+\left(\frac{-1}{8}\right)=\frac{18}{24}-\frac{60}{24}-\frac{40}{24}-\frac{3}{24}=\frac{-85}{24}\)
\(\frac{3}{4}-\left(\frac{5}{2}+\frac{5}{3}\right)+\left(\frac{-1}{2}\right)^3\)
\(=\frac{3}{4}-\frac{25}{6}+\frac{-1}{8}\)
\(=\frac{18-100-3}{24}\)
\(=\frac{-85}{24}\)
Tk mk nha!
(1-1/3).(1-1/5).(1-1/7).(1-1/9).(1-1/11).(1-1/13).(1-1/2).(1-1/4).(1-1/6).(1-1/8).(1-1/10)
=2/3.4/5.6/7.8/9.10/11.12/13.1/2.3/4.5/6.7/8.9/10
=8/15.48/63.120/143.3/8.35/48.9/10
=384/945.360/1144.315/480
=138240/1081080.315/480
=43545600/518918400=84/1001
3/4-[(-5/3)-(1/12+2/9)]
3/4-[(-5/3)-11/36]
3/4+71/36
49/18
\(\frac{3}{4}-\left[\left(-\frac{5}{3}\right)-\left(\frac{1}{12}+\frac{2}{9}\right)\right]\)
\(=\frac{3}{4}-\left[-\frac{5}{3}-\frac{11}{36}\right]\)
\(=\frac{3}{4}-\left(-\frac{71}{36}\right)=\frac{3}{4}+\frac{71}{36}\)
\(=\frac{49}{18}\)