\(\dfrac{7}{9}-\dfrac{\left|x\right|}{3}=\dfrac{1}{9}\Rightarrow-\dfrac{\left|x\right|}{3}=\dfrac{1}{9}-\dfrac{7}{9}=\dfrac{-2}{3}\)
\(\Rightarrow-\left|x\right|=-2\Rightarrow\left|x\right|=2\Rightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)
Vậy, x = 2 hoặc x = -2.
thực hiện phép tính
a\(\dfrac{5}{7}+\dfrac{9}{23}+\dfrac{-12}{7}+\dfrac{14}{23}\)
b\(\left(7-2\dfrac{3}{5}\right).2\dfrac{4}{33}-2\dfrac{3}{5}:\dfrac{1}{2}+\dfrac{7}{5}\)
c\(\dfrac{-7}{9}:\dfrac{8}{15}+\dfrac{-7}{9}.\dfrac{7}{15}+5\dfrac{7}{9}\)
d\(\left(16\dfrac{3}{8}-19\dfrac{3}{4}\right)-\left(12\dfrac{3}{8}-17\dfrac{3}{4}\right)\)
giúp mình nhé
\(\dfrac{5}{\left|x\right|}\) - \(\dfrac{4}{3}\) = \(\dfrac{38}{24}\) -\(\dfrac{1}{7}\) . ( 9\(\dfrac{1}{2}\) - 8,75 ) : \(\dfrac{2}{7}\) + 0,625 : ( -1\(\dfrac{2}{3}\) )
\(\dfrac{7}{9}\) - \(\dfrac{\left|x\right|}{3}\) = \(\dfrac{1}{9}\) [ \(\dfrac{4}{9}\) + ( \(\dfrac{3}{8}\) x - \(\dfrac{1}{2}\) ) ] . \(\dfrac{6}{11}\) = \(\dfrac{18}{55}\)
\(\dfrac{2}{9}\) . ( 3x - \(\dfrac{1}{2}\) ) - \(\dfrac{5}{6}\) = -1\(\dfrac{1}{3}\)
tính M = \(\dfrac{1,6:\left(1\dfrac{3}{5}.1,25\right)}{0,64-\dfrac{1}{25}}+\dfrac{\left(1,08-\dfrac{2}{25}\right):\dfrac{4}{7}}{\left(5\dfrac{5}{9}-2\dfrac{1}{4}\right).2\dfrac{2}{17}}+0,6.0,5:\dfrac{2}{5}\)
Tính giá trị biểu thức
a, \(\dfrac{5.8-5.6}{10}\) b, \(\dfrac{\left(-4\right)^2}{5}\) B = \(\dfrac{3}{7}+\left(\dfrac{-1}{5}+\dfrac{-3}{7}\right)\) C = \(\left(6-2\dfrac{4}{5}\right).3\dfrac{1}{8}-1\dfrac{3}{5}:\dfrac{1}{4}\)
D = \(\left(\dfrac{-5}{24}+0,75+\dfrac{7}{12}\right):\left(-2\dfrac{1}{8}\right)\) E = \(\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{11}+1\dfrac{5}{7}\) F = \(\dfrac{6}{7}+\dfrac{5}{8}:5-\dfrac{3}{16}.\left(-2\right)^2\)
Tính
a, 4\(\times\left(-\dfrac{1}{2}\right)^3-2\times\left(-\dfrac{1}{2}\right)^2+3\times\left(-\dfrac{1}{2}\right)+1\)
b, \(\dfrac{4^6\times9^5+6^9\times120}{-8^4\times3^{12}+6^{11}}\)
c, \(\dfrac{155-\dfrac{10}{7}-\dfrac{5}{11}+\dfrac{5}{23}}{403-\dfrac{26}{7}-\dfrac{13}{11}+\dfrac{12}{23}}+\dfrac{\dfrac{3}{5}+\dfrac{3}{13}-0,9}{\dfrac{7}{91}+0,2-\dfrac{3}{10}}\)
d,\(\dfrac{30\times4^7\times3^{29}-5\times14^5\times2^{12}}{54\times6^{14}\times9^7-12\times8^5\times7^5}\)
Bài 1:
\(a,\dfrac{62}{7}.x=\dfrac{29}{9}:\dfrac{3}{56}\)
\(b,\dfrac{1}{5}:x=\dfrac{1}{5}-\dfrac{1}{7}\)
\(c,x-\left(\dfrac{50x}{100}+\dfrac{25x}{200}\right)=11\dfrac{1}{4}\)(11 và 1/4 là hỗn số chứ ko phải là 11.1/4 các bn nhé)
\(d,x-\dfrac{25x}{100}=60-x+\dfrac{25x}{100}\)
Tính:
\(\left(1+\dfrac{7}{9}\right)\times\left(1+\dfrac{7}{20}\right)\times\left(1+\dfrac{7}{33}\right)\times\left(1+\dfrac{7}{48}\right)\times.......\times\left(1+\dfrac{7}{180}\right)\)
Thần đồng nào giỏi toán ! Giúp Mik với nha! Mik xin chân thành cảm ơn!
Tìm tập hợp các số nguyên m biết:
\(2017^0\)-11≤3m≤\(\left(\dfrac{2016}{2017}-\dfrac{2017}{2018}\right).\left(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{6}\right).\left(-3^2+9\right)\)
tìm x
a,\(\dfrac{5}{6}-\left(\dfrac{3}{6}x-\dfrac{1}{5}\right)=\dfrac{-5}{12}\)
b\(\left(4x-3\right).\left(\dfrac{5}{4}x+2\right)=0\)
c\(\left|\dfrac{7}{8}x-\dfrac{2}{3}\right|-\dfrac{3}{4}=1,5\)
d\(\left(\dfrac{3}{5}x-\dfrac{1}{2}\right)^3=\dfrac{8}{125}\)
giúp mình nhé mình đang cần gấp
