Tìm y biết: ( 7 x 13 + 8 x 13 ) : 9 2 3 - y = 39
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a) \(y-6:2-\left(48-24.2:6-3\right)=0.\)
\(\Rightarrow y-3-\left(48-8-3\right)=0\)
\(\Rightarrow y-3-37=0\)
\(\Rightarrow y=0+37+3=40\)
Vậy y = 40
b) \(\left(7.13+8.13\right):\left(9\frac{2}{3}-y\right)=39\)
\(\Rightarrow195:\left(\frac{29}{3}-y\right)=39\)
\(\Rightarrow\frac{29}{3}-y=195:39=5\)
\(\Rightarrow y=\frac{29}{3}-5=\frac{14}{3}\)
Vậy y=\(\frac{14}{3}\)
a) y - 6 : 2 - ( 48 - 24 x 2 : 6 - 3 ) = 0
y - 6 : 2 - ( 48 - 48 : 6 - 3 ) = 0
y - 6 : 2 - ( 48 - 8 - 3 ) = 0
y - 6 : 2 - 37 = 0
y - 3 = 0 + 37
y - 3 = 37
y = 37 + 3
y = 40
b) ( 7 x 13 + 8 x 13 ) : ( \(9\frac{2}{3}\) - y ) = 39
( 15 x 13 ) : ( \(9\frac{2}{3}\) - y ) = 39
195 : ( \(9\frac{2}{3}\) - y ) = 39
\(9\frac{2}{3}\) - y = 195 : 39
\(9\frac{2}{3}-y=5\)
\(y=9\frac{2}{3}-5\)
\(y=\frac{14}{3}\)
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
\(\left[7\times13+8\times13\right]:\left[9\frac{2}{3}-y\right]=39\)
\(\left[\left(7+8\right)\times13\right]:\left[\frac{29}{3}-y\right]=39\)
\(\left[15\times13\right]:\left[\frac{29}{3}-y\right]=39\)
\(195:\left[\frac{29}{3}-y\right]=39\)
\(\frac{29}{3}-y=195:30\)
\(\frac{29}{3}-y=\frac{13}{2}\)
\(y=\frac{29}{3}-\frac{13}{2}\)
\(y=\frac{19}{6}\)
Học tốt #
[ 7 x 13 + 8 x 13 ] : [ \(9\frac{2}{3}\) - y ] = 39
[ 13 x ( 7 + 8 )] : [ \(9\frac{2}{3}\)- y ] = 39
[ 13 x 15 ] : [\(9\frac{2}{3}\) - y ] = 39
195 : [\(\frac{29}{3}\) - y ] = 39
[ \(\frac{29}{3}\) - y ] = 195 : 39 (*1 )
[\(\frac{29}{3}-y\)] = 5
y = \(\frac{29}{3}-5\)
y = \(\frac{14}{3}\)
Bài 1:
a) \(=\dfrac{8}{15}\left(\dfrac{7}{13}+\dfrac{6}{13}\right)=\dfrac{8}{15}.1=\dfrac{8}{15}\)
b) \(=\dfrac{3.3-7-2.4}{12}=-\dfrac{6}{12}=-\dfrac{1}{2}\)
Bài 2:
\(\dfrac{x}{2,7}=-\dfrac{2}{3,6}\Rightarrow x=\dfrac{\left(-2\right).2,7}{3,6}\Rightarrow x=-\dfrac{3}{2}\)
Bài 3:
\(\dfrac{x}{2}=\dfrac{y}{5}=\dfrac{x+y}{2+5}=-\dfrac{21}{7}=-3\)
\(\Rightarrow\left\{{}\begin{matrix}x=\left(-3\right).2=-6\\y=\left(-3\right).5=-10\end{matrix}\right.\)
a) y - 6 : 2 - (48 - 24 x 2 : 6 - 3) = 0
y - 3 - (48 - 48 : 6 - 3) = 0
y - 3 - (48 - 8 - 3) = 0
y - 3 - 37 = 0
y - ( 3+37) = 0
y - 40 =0
y =0+40
Y =40
b) ( 7x13 - 8x13) : ( 9 2/3 -y) =39
(7+8)x13 : (29/3 - y) =39
15 x 13 : (29/3-y) =39
195 : (29/3 - y) =39
29/3 - y =195 : 39
29/3 - y = 5
y = 29/3 - 5
y = 14/3
áp dung tc cua day ti so bang nhau co
\(\frac{x}{2}=\frac{y}{3}=\frac{x+y}{2+3}=\frac{-15}{5}=-3\)
x=-6;y=-9
y b lam tuong tuu nhung thay cong bang tru
y c
co \(\frac{x}{y}=\frac{7}{-9}\Rightarrow\frac{x}{7}=\frac{y}{-9}\Rightarrow\frac{2x}{14}=\frac{3y}{-27}\)
lam tuong tuu y a
d,
h cheo
7 ( x + 4 ) = 4 ( 7 + y )
7x + 28 = 4y + 28
7x = 4y
\(\Rightarrow\frac{x}{4}=\frac{y}{7}\)
ap dung tc cua day ti so bang nhau va lam tuong tuu y a
t i c k nha
Tính đúng y = 4 2 3