tính)
a) \(\dfrac{3}{4}+\dfrac{-7}{12}-\dfrac{2}{3}\)
b) \(15\dfrac{5}{6}+\left(\dfrac{17}{18}-\dfrac{5}{12}\right)\)
Tính
A) \(\dfrac{1}{6}-\dfrac{2}{3}.\dfrac{5}{4}\)
B) \(\dfrac{9}{3^{12}.27^6}\)
Cho đẳng thức: (-8).15=12.(-10) Tỉ lệ thức đc suy ra từ đẳng là:
A.\(\dfrac{-18}{12}\)=\(\dfrac{15}{-10}\)
B.\(\dfrac{15}{12}\)=\(\dfrac{-10}{-8}\)
C.\(\dfrac{-8}{-10}\)=\(\dfrac{15}{12}\)
D.\(\dfrac{-8}{15}\)=\(\dfrac{12}{-10}\)
Mong mn giúp đỡ.
Mk đang cần gấp.
Thanks:)
Tìm x :
a, \(\dfrac{11}{12}\) - (\(\dfrac{2}{5}\) +x) = \(\dfrac{2}{3}\) b, x+\(\dfrac{2}{3}\) =\(\dfrac{3}{5}\) - \(\dfrac{-1}{6}\) c, x-[\(\dfrac{17}{2}\) -(\(\dfrac{-3}{7}\) + \(\dfrac{5}{3}\) )]=\(\dfrac{-1}{3}\)
d,\(\dfrac{9}{2}\) - [\(\dfrac{2}{3}\) - (x+\(\dfrac{7}{4}\) )] =\(\dfrac{-5}{4}\)
Mọi người giúp mình nha
\(a,\left|x+\dfrac{1}{5}\right|-4=-2\)
\(b,-\dfrac{15}{12}x+\dfrac{3}{7}=\dfrac{6}{5}x+-\dfrac{1}{2}\)
Tìm x trong các tỉ lệ thức sau:
a)\(\dfrac{-2,6}{x}=\dfrac{-12}{42}\) b)2,5:x=1,5:12
c)\(\dfrac{x-1}{x+5}=\dfrac{6}{7}\) d)\(\dfrac{x}{6}=\dfrac{24}{25x}\) e)\(\dfrac{x-2}{9}=\dfrac{4}{x-2}\)
Bài 1: Thực hiện phép tính sau:
\(a,\dfrac{9}{18}-\dfrac{-7}{12}+\dfrac{13}{32}\)
\(b,\dfrac{5}{-8}+\dfrac{14}{25}-\dfrac{6}{10}\)
Tìm x:
a) \(\dfrac{2x-3}{3}+\dfrac{-3}{2}=\dfrac{5-3x}{6}-\dfrac{1}{3}\)
b) \(\dfrac{2}{3x}-\dfrac{3}{12}=\dfrac{4}{5}-\left(\dfrac{7}{x}-2\right)\)
cho đẳng thức a.d=b.c tỉ lệ thức nào sau đây sai ( a, b , c , d khác 0 ) :
A \(\dfrac{a}{b}\) = \(\dfrac{c}{d}\) B \(\dfrac{d}{b}\) = \(\dfrac{c}{a}\) C \(\dfrac{b}{d}\) = \(\dfrac{c}{a}\) D \(\dfrac{a}{c}\) = \(\dfrac{b}{d}\)
giúp mình đi nha mn =(