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\(\left(\frac{2}{15}+\frac{2}{35}+\frac{2}{63}\right).Y=4\)
\(\Rightarrow\frac{2}{9}.Y=4\)
\(\Rightarrow Y=4:\frac{2}{9}\)
\(\Rightarrow Y=18\)
Vậy số cần tìm là 18.
~Study well~
\(\left(\frac{2}{15}+\frac{2}{35}+\frac{2}{63}\right).y=4\)
\(\left(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}\right).y=4\)
\(\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}\right).y=4\)
\(\left(\frac{1}{3}-\frac{1}{9}\right).y=4\)
\(\frac{2}{9}.y=4\)
\(y=18\)
Vậy \(y=18\)
\(\dfrac{4}{51}\times y+y+y\times\dfrac{47}{51}=\dfrac{5}{4}+\dfrac{1}{6}\\y\times\left(\dfrac{4}{51}+1+\dfrac{47}{51}\right)= \dfrac{17}{12}\\ y\times2=\dfrac{17}{12}\\ y=\dfrac{17}{24}\)
c)\(\dfrac{3}{8}\times\dfrac{5}{8}+y=\dfrac{5}{4}\)
\(\dfrac{15}{64}+y=\dfrac{5}{4}\)
\(y=\dfrac{5}{4}-\dfrac{15}{64}\)
\(y=\dfrac{65}{64}\)
d, \(\dfrac{3}{8}+\dfrac{5}{8}\times y=\dfrac{5}{4}\)
\(\dfrac{5}{8}\times y=\dfrac{5}{4}-\dfrac{3}{8}\)
\(\dfrac{5}{8}\times y=\dfrac{7}{8}\)
\(y=\dfrac{7}{8}:\dfrac{5}{8}\)
\(y=\dfrac{7}{5}\)
a, 3/4 x y = 3/5 + 3/10
3/4 x y = 9/10
y = 9/10 : 3/4
y = 6/5
b, 3/5 : y = 3/4 - 2/5
3/5 : y = 7/20
y = 3/5 : 7/20
y = 12/7
Y*25%+y*3/4*y=20
=>y*(25%+3/4)*y=20
=>y*y=20 =>y=4,472135954999579(đề sai hay sao ấy)
4,3 \(\times\) y + y + 4,7 \(\times\) y = 2023
4,3 \(\times\) y + y \(\times\) 1 + 4,7 \(\times\) y = 2023
y \(\times\) ( 4,3 + 1 + 4,7) = 2023
y \(\times\) 10 = 2023
y = 2023 : 10
y = 202,3
4,3 y + y + 4,7 y = 2023
4,3 y + y 1 + 4,7 y = 2023
y ( 4,3 + 1 + 4,7) = 2023
y 10 = 2023
y = 2023 : 10
y = 202,3
Kê chưa
y + 276 x y - 177 x y = 10200
y x 1 + 276 x y - 177 x y = 10200
y x ( 1 + 276 - 177 ) = 10200
y x 100 = 10200
y = 10200 : 100
y = 102.
#Y/n
102 nhé