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a;\(\dfrac{-6}{11}\) : \(\dfrac{12}{55}\) = \(\dfrac{-5}{2}\)
b;\(\dfrac{7}{12}\) + \(\dfrac{5}{72}\) - \(\dfrac{11}{36}\) = \(\dfrac{47}{72}\) - \(\dfrac{11}{36}\) = \(\dfrac{25}{72}\)
c;\(\dfrac{13}{10}\) : \(\dfrac{-5}{13}\) = \(\dfrac{-169}{50}\)
d; {\(\dfrac{5}{12}\) + \(\dfrac{5}{11}\) } : { \(\dfrac{5}{3}\) -\(\dfrac{7}{11}\) } = \(\dfrac{115}{132}\) : \(\dfrac{34}{33}\) = \(\dfrac{115}{136}\)
lưu ý mk ko chép đầu bài
mình cần gấp lắm đến chiều mai là phải nộp rùi
giúp mình nha thanks cá bạn trước ko có tâm trạng mà cười nữa
Ta có: \(\left(x+\frac{1}{3}\right)^3=0,125\) \(\Leftrightarrow\left(x+\frac{1}{3}\right)^3=\left(0,5\right)^3\)
\(\Leftrightarrow\) \(x+\frac{1}{3}=0,5\) \(\Leftrightarrow\) \(x=\frac{1}{6}\)
Vậy \(x=\frac{1}{6}\)
a ) 3/4 . x = 1
=> x = 1 : 3/4
=> x = 1 . 4/3
=> x = 4/3
Vậy x = 4/3
b ) 4/7x = 9/8 - 0,125
=> 4/7x = 9/8 - 1/8
=> 4/7x = 8/8 = 1
=> x = 1 : 4/7
=> x = 1. 7/4
=> x = 7/4
Vậy x = 7/4
Chúc học giỏi
a) \(\left(3\frac{1}{2}-2x\right).3\frac{1}{3}=7\frac{1}{3}\)
\(\left(\frac{7}{2}-2x\right).\frac{10}{3}=\frac{22}{3}\)
\(\frac{7}{2}-2x=\frac{11}{5}\)
\(2x=\frac{13}{10}\)
\(x=\frac{13}{20}\)
Vậy ...
b) \(\frac{4}{9}x=\frac{9}{8}-0,125\)
\(\frac{4}{9}x=1\)
\(x=\frac{9}{4}\)
Vậy...
=2/3+3/4:6/7+1/8.4/3-101/24
=2/3+21/24+4/24-31/24
=16/24+21/24+4/24-31/24
=10/24=5/12
a: \(=\dfrac{1}{4}\cdot\dfrac{12}{5}\cdot\dfrac{100}{7}\cdot\dfrac{49}{100}\)
\(=\dfrac{1}{4}\cdot\dfrac{12}{5}\cdot\dfrac{49}{7}=\dfrac{3}{5}\cdot7=\dfrac{21}{5}\)
b: \(=\dfrac{3}{8}+\dfrac{1}{8}\cdot\dfrac{3}{4}-\dfrac{5}{4}\)
\(=\dfrac{12}{32}+\dfrac{3}{32}-\dfrac{40}{32}=\dfrac{-25}{32}\)
c: \(=\dfrac{4}{9}\left(\dfrac{-13}{27}-\dfrac{14}{27}\right)-\dfrac{5}{9}=\dfrac{-4}{9}-\dfrac{5}{9}=-1\)
d: \(=\dfrac{2}{4}\left(\dfrac{4}{3\cdot7}+\dfrac{4}{7\cdot11}+...+\dfrac{4}{91\cdot95}\right)\)
\(=\dfrac{1}{2}\left(\dfrac{1}{3}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{11}+...+\dfrac{1}{91}-\dfrac{1}{95}\right)\)
\(=\dfrac{1}{2}\cdot\dfrac{92}{285}=\dfrac{46}{285}\)
a) \(\dfrac{3}{4}x=1\)
\(x=1:\dfrac{3}{4}\)
\(x=1.\dfrac{4}{3}\)
\(x=\dfrac{4}{3}\)
b)\(\dfrac{4}{7}x=\dfrac{9}{8}-0,125\)
\(\dfrac{4}{7}x=\dfrac{9}{8}-\dfrac{1}{8}\)
\(\dfrac{4}{7}x=1\)
\(x=1:\dfrac{4}{7}\)
\(x=1.\dfrac{7}{4}\)
\(x=\dfrac{7}{4}\)
a) \(\dfrac{3}{4}x=1\)
\(x=1:\dfrac{3}{4}=1.\dfrac{4}{3}\)
\(x=\dfrac{4}{3}\)
Vậy \(x=\dfrac{4}{3}\)
b) \(\dfrac{4}{7}x=\dfrac{9}{8}-0,125\)
\(\Leftrightarrow\dfrac{4}{7}x=\dfrac{9}{8}-\dfrac{1}{8}\)
\(\Rightarrow\dfrac{4}{7}x=1\)
\(x=1:\dfrac{4}{7}=1.\dfrac{7}{4}\)
\(x=\dfrac{7}{4}\)
Vậy \(x=\dfrac{7}{4}\)
Lần sau bạn chú ý ghi đề đầy đủ.
Coi đây là bài toán tính/ rút gọn
$(-0,125)^3.(-8)^3=[(-0,125)(-8)]^3=1^3=1$
\(\left(-0.125\right)^3\cdot\left(-8\right)^3=\left(\dfrac{-1}{8}\cdot\left(-8\right)\right)^3=1^3=1\)