Ta có: \(2,8:\left(\frac{1}{5}-3x\right)=\frac{7}{5}\)
\(\Leftrightarrow\frac{14}{5}:\left(\frac{1}{5}-3x\right)=\frac{7}{5}\)
\(\Leftrightarrow\frac{1}{5}-3x=2\)
\(\Leftrightarrow3x=\frac{1}{5}-2=\frac{9}{5}\)
hay \(x=\frac{3}{5}\)
Vậy: \(x=\frac{3}{5}\)
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 )
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 )
3(1/2-x)-5(x-1/10)=-7/4
4(3/4+x)-1/5=7x-1/7 giúp mik với
T = ( 1 - 1/3 ) ( 1 - 1/5 ) ( 1 - 1/7 )
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) \(\dfrac{4}{5}+\dfrac{5}{7}:x=\dfrac{1}{6}\)
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\(\frac{-6}{11}:\left(-3\right)\))
Tính
\(\dfrac{\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{1}{7}}{\dfrac{7}{6}-\dfrac{7}{8}+\dfrac{7}{14}+\dfrac{7}{10}}\)
M=\(\dfrac{\dfrac{7}{2012}+\dfrac{7}{9}-\dfrac{1}{4}}{\dfrac{5}{9}-\dfrac{3}{2012}-\dfrac{1}{2}}\) tính M
Tính nhanh [1/2 cộng 3/16] chia1/7 trừ [7 cộng 5/8] nhân 1/2
