(7×13+8×13)÷(9va2/3-y)=39
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a) y - 6 chia 2 - ( 48 - 24 x 2 chia 6 - 3 ) = 0
=> y - 6 chia 2 - ( 48 - 48 chia 6 - 3 ) = 0
=> y - 6 chia 2 - ( 48 - 8 -3 ) = 0
= > y - 6 chia 2 - 37 = 0
=> y - 6 chia 2 = 0 + 37
=> y - 6 chia 2 = 37
=> y -6 = 37 chia 2
=> y - 6 = 37 / 2
=> y = 37 / 2 + 6
=> y = 49 / 2
Vậy y = 49 / 2
b) ( 7 x 13 + 8 x 13 ) chia ( 92 /3-y ) = 39
=> ( 91 + 104 ) chia ( 92/3 - y ) =39
=> 195 chia ( 92 /3 - y ) = 39
=> 92/3 - y = 7605
=> y = 7605 + 92/3
=> y = 22907 /3
Vậy y = 22907 / 3
\(\dfrac{7.13+8.13}{9\dfrac{2}{3}-y}=39\)
=> \(\dfrac{13.\left(7+8\right)}{\dfrac{29}{3}-y}=39\)
=> \(\dfrac{13.15}{\dfrac{29}{3}-y}=39\)
=> \(\dfrac{195}{\dfrac{29}{3}-y}=39\)
=> \(\dfrac{29}{3}-y=5\)
=> y = \(\dfrac{14}{3}\)
@Bùi Thị Phương Anh
\(\dfrac{7.13+8.13}{9\dfrac{2}{3}-y}=39\)
\(\Leftrightarrow\dfrac{13\left(7+8\right)}{\dfrac{29}{3}-y}=39\)
\(\Leftrightarrow\dfrac{13.15}{\dfrac{29}{3}-y}=39\)
\(\Leftrightarrow\dfrac{195}{\dfrac{29}{3}-y}=39\)
\(\Leftrightarrow\dfrac{29}{3}-y=39\)
\(\Leftrightarrow y=\dfrac{14}{3}\)
Vậy ....
Dấu \(.\)là dấu nhân
\(\left(7.13+8.13\right):\left(9\frac{2}{3}-y\right)=39\)
\(\Rightarrow13.\left(7+8\right):\left(\frac{29}{3}-y\right)=39\)
\(\Rightarrow13.15:\left(\frac{29}{3}-y\right)=39\)
\(\Rightarrow195:\left(\frac{29}{3}-y\right)=39\)
\(\Rightarrow\frac{29}{3}-y=195:39\)
\(\Rightarrow\frac{29}{3}-y=5\)
\(\Rightarrow y=\frac{29}{3}-5\)
\(\Rightarrow y=\frac{29}{3}-\frac{15}{3}\)
\(\Rightarrow y=\frac{14}{3}\)
Vậy \(y=\frac{14}{3}\)
~ Ủng hộ nhé .
P/s : Đúng nha
(91+104):(29|3-x)=39
195:(29|3-x)=39
29|3-x=195:39=5
x=29|3-5
x=14|3