Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
(4 - \(\dfrac{5}{12}\)) : 2 + \(\dfrac{5}{24}\)
= (\(\dfrac{48}{12}\) - \(\dfrac{5}{12}\)) x \(\dfrac{1}{2}\) + \(\dfrac{5}{24}\)
= \(\dfrac{43}{12}\) x \(\dfrac{1}{2}\) + \(\dfrac{5}{24}\)
= \(\dfrac{43}{24}\) + \(\dfrac{5}{24}\)
= \(\dfrac{48}{24}\)
= 2
Ta có: x=2y ; y=3a ; a=5 x 8 + 4
=> a=44
=> y = 44 x 3 = 132
=> x = 132 x 2 = 264
x chia 2 đc y => x = 2y (1)
y chia 3 dc a => y = 3a (2)
Từ (1) và (2) => x = 2 . 3 .a = 6a
a chia 5 đc 8 dư 4 => a = 5.8 + 4 = 44
=> x = 6 . 44 = 264
a; (4 - \(\dfrac{12}{5}\)).\(\dfrac{25}{8}\) - \(\dfrac{2}{5}\) : - \(\dfrac{4}{25}\)
= 4.\(\dfrac{25}{8}\) - \(\dfrac{12}{5}\).\(\dfrac{25}{8}\) - \(\dfrac{2}{5}\) x \(\dfrac{-25}{4}\)
= \(\dfrac{25}{2}\) - \(\dfrac{15}{2}\) + \(\dfrac{5}{2}\)
= \(\dfrac{10}{2}\) + \(\dfrac{5}{2}\)
= \(\dfrac{15}{2}\)
b; (- \(\dfrac{5}{24}\) + \(\dfrac{3}{4}\) - \(\dfrac{7}{12}\)) : (- \(\dfrac{5}{16}\))
= (- \(\dfrac{5}{24}\)) : (-\(\dfrac{5}{16}\)) + \(\dfrac{3}{4}\) : (- \(\dfrac{5}{16}\)) - \(\dfrac{7}{12}\) : (- \(\dfrac{5}{16}\))
= \(\dfrac{5}{24}\) x \(\dfrac{16}{5}\) - \(\dfrac{3}{4}\) x \(\dfrac{16}{5}\) + \(\dfrac{7}{12}\) x \(\dfrac{16}{5}\)
= \(\dfrac{2}{3}\) - \(\dfrac{12}{5}\) + \(\dfrac{28}{15}\)
= \(\dfrac{10}{15}\) - \(\dfrac{36}{15}\) + \(\dfrac{28}{15}\)
= \(\dfrac{-26}{15}\) + \(\dfrac{28}{15}\)
= \(\dfrac{2}{15}\)
a)2/9-(-4/9)=6/9=2/3
b)(-1/24+0,25+1 1/12):(-1/2)2
=(-1/24+6/24+26/24):(-1/2).2
=31/24.-2.2
=-31/12.2
=-31/6
c)3/13.(-5/9)+10/13.(-5/9)+(-4/9)
=-5/9(3/13+10/13)+(-4/9)
=-5/9.1+(-4/9)
=-1
nhanh
\(\left(4-\dfrac{5}{12}\right):\left(2+\dfrac{5}{24}\right)\)
\(=\dfrac{43}{12}:\dfrac{53}{24}\)
\(=\dfrac{43}{12}\cdot\dfrac{24}{53}\)
\(=\dfrac{43\cdot2}{1\cdot53}\)
\(=\dfrac{86}{53}\)