thực hiện phép tính:
1)\(\frac{12}{7}:\frac{16}{5}\)
2)\(\frac{-2}{7}:\frac{6}{11}\)
3)\(\frac{-1}{7}:\frac{-1}{5}\)
4)\(\left(-2\right):\frac{6}{11}\)
5\(\frac{-6}{11}:\left(-3\right)\))
\(13\frac{3}{5}+4\frac{3}{4}-8\frac{3}{5}\)
Tính B = \(\left(\frac{1}{1009}+\frac{1}{1010}+....+\frac{1}{2015}+\frac{1}{2016}\right):\left(\frac{1}{1}-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+....-\frac{1}{2016}\right)\)
Tìm \(x\) biết :
a) \(x.\dfrac{3}{7}=\dfrac{2}{3}\)
b) \(x:\dfrac{8}{11}=\dfrac{11}{3}\)
c) \(\dfrac{2}{5}:x=-\dfrac{1}{4}\)
d) \(\dfrac{4}{7}.x-\dfrac{2}{3}=\dfrac{1}{5}\)
e) \(\dfrac{2}{9}-\dfrac{7}{8}.x=\dfrac{1}{3}\)
g) \(\dfrac{4}{5}+\dfrac{5}{7}:x=\dfrac{1}{6}\)
4/5 : ( 4/5 . -5/4) : ( 16/25 - 1/5 )
11/12 : ( 7/9 + -1/3 ) - ( 2/3 - 5/15 )
-2/5 . ( 9/8 + 16/32 -3/4 ) - 9/10
( 4/3 + 8/3 ) . ( 7/4 - 6/4 ) : ( 6/5 + 12/5 + 1/5 )
4/5 : ( 4/5 . -5/4) : ( 16/25 - 1/5 )
11/12 : ( 7/9 + -1/3 ) - ( 2/3 - 5/15 )
-2/5 . ( 9/8 + 16/32 -3/4 ) - 9/10
( 4/3 + 8/3 ) . ( 7/4 - 6/4 ) : ( 6/5 + 12/5 + 1/5 )
(5+8/17): x +(-4/17):x +(3+1/7) :(17+1/3) = 4/11
Tìm \(x\) biết :
a) \(\dfrac{5}{4}.x=\dfrac{4}{7}\)
b) \(\dfrac{3}{4}:x=\dfrac{1}{2}\)
3(1/2-x)-5(x-1/10)=-7/4
4(3/4+x)-1/5=7x-1/7 giúp mik với
