2/9 + 1/6 giúp mình đi
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M = 1 +2 -3 -4 +5 +6 -7 -8 +9 +....+994 -995 -996 +997 +998
M = 1 +(2 +5 -3 -4) + (6 +9 -7 -8)+....+(994 +997 -995 -996) +998
M = 1 +0 +0 +....+0 +998
M = 999.
a) \(\dfrac{7}{5}x\div\left(9-6\dfrac{13}{21}\right)=2\dfrac{13}{25}\)
\(\dfrac{7}{5}x\div\left(9-\dfrac{139}{21}\right)=\dfrac{63}{25}\)
\(\dfrac{7}{5}x\div\dfrac{50}{21}=\dfrac{63}{25}\)
\(\dfrac{7}{5}x=6\)
\(x=\dfrac{30}{7}\)
b) \(\left(1,16-x\right)\times5,25\div\left(10\dfrac{5}{9}-7\dfrac{1}{4}\right)\times2\dfrac{2}{17}=75\%\)
\(\left(1,16-x\right)\times5,25\div\left(\dfrac{95}{9}-\dfrac{29}{4}\right)\times\dfrac{36}{17}=\dfrac{75}{100}\)
\(\left(1,16-x\right)\times5,25\div\dfrac{119}{36}=\dfrac{17}{48}\)
\(\left(1,16-x\right)\times5,25=\dfrac{2023}{1728}\)
\(1,16-x=\dfrac{289}{1296}\)
\(x=0,9370061728\)
52 .(y : 78) = 3380
y : 78 = 3380 : 52
y : 78 = 65
y = 65 . 78
y = 5070
Ư ( 4 ) = { -4; -2; -1; 1; 2; 4 }
Ư ( 6 ) = { -6; -3; -2; -1; 1; 2; 3; 6 }
Ư ( 9 ) = { -9; -3; -1; 1; 3; 9 }
Ư ( 13 ) = { -13; -1; 1; 13 }
Ư ( 1 ) = { -1; 1 }
S=1+2-3-4+......+993+994-995-996+997+998
=1+(2-3-4+5)+(6-7-8+9)+......+(994-995-996+997)+998
=1+0+0+......+0+998
=999
1 / 9 + 2 / 9 + 4 / 9 = 7 / 9
5 / 5 + 6 / 5 + 1 = 15 / 5 = 3
12 / 2 + 4 / 2 + 1 + 3 / 2 = 21 / 2
7 / 3 + 6 / 3 + 1 + 1 = 19 / 3
\(\frac{\left|x-1\right|}{-8}=-\frac{3}{4}\)
=> |x - 1|.4 = (-8) . (-3)
=> |x - 1| . 4 = 24
=> |x - 1| = 24 : 4
=> |x - 1| = 6
=> \(\orbr{\begin{cases}x-1=6\\x-1=-6\end{cases}}\)
=> \(\orbr{\begin{cases}x=7\\x=-5\end{cases}}\)
Vậy ...
|2 - x| - 7 = 6/-2
=> |2 - x| = -3 + 7
=> |2 - x| = 4
=> \(\orbr{\begin{cases}2-x=4\\2-x=-4\end{cases}}\)
=> \(\orbr{\begin{cases}x=-2\\x=6\end{cases}}\)
vậy ...
\(\frac{-2}{1-x}=\frac{1-x}{-8}\)
=> (-2).(-8) = (1 - x).(1 - x)
=> (1 - x)2 = 16
=> (1 - x)2 = 42
=> \(\orbr{\begin{cases}1-x=4\\1-x=-4\end{cases}}\)
=> \(\orbr{\begin{cases}x=-3\\x=5\end{cases}}\)
Vậy ...
còn lại tự lm tương tự
\(\frac{2}{9}\)+\(\frac{1}{6}\)= \(\frac{7}{18}\)
2/9+1/6
\(\dfrac{2}{9}\)=\(\dfrac{2X6}{9X6}\)=\(\dfrac{12}{54}\)
\(\dfrac{1}{6}\)=\(\dfrac{1X9}{6X9}\)=\(\dfrac{9}{54}\)
\(\dfrac{2}{9}\)+\(\dfrac{1}{6}\)=\(\dfrac{12}{54}\)+\(\dfrac{9}{54}\)=\(\dfrac{21}{54}\)
T.I.C.K cho mình nha !