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\(\left(45,8-y-8,2\right)\times23\%=12,4\times0,23\)
\(\left(37,6-y\right)\times0,23=12,4\times0,23\)
\(37,6-y=12,4\)
\(y=25,2\)
y x 55 - y x 44 -y = 45.8
y x ( 55 - 44 - 1 ) = 45.8
y x 10 = 45.8
y = 45.8 : 10
y = 4.58
y x 55 - y x 44 - y = 45,8
y x 55 - y x 44 - y x 1 = 45,8
y x ( 55- 44- 1) = 45,8
y x 10 = 45 , 8
y = 45,8 : 10
y = 4,58
y x 55 - y x 44 - y = 45,8 y x ( 55 - 44 - 1 ) =45,8 y x 10 =45,8 y =45,8:10 y =4,58
a.45,8 +y x2,5 =55,05
y x 2,5=9,25
y=3,7
b.45,8 + y x2,5 = 55,05 :2
45,8 + y x 2,5 =27,525
y x 2,5=-18,275
y=-7,31
c.24,3 + y :1,6 -3,4 =30,24
y:1,6 +20,9=30,24
y:1,6=9,34
y=14,944
Dấu \(.\)là dấu nhân
\(y+y.\frac{1}{4}:\frac{2}{7}+y:\frac{2}{9}=255\)
\(\Rightarrow y+y.\frac{1}{4}.\frac{7}{2}+y.\frac{9}{2}=255\)
\(\Rightarrow y+y.\frac{7}{8}+y.\frac{9}{2}=255\)
\(\Rightarrow y.\left(1+\frac{7}{8}+\frac{9}{2}\right)=255\)
\(\Rightarrow y.\left(\frac{8}{8}+\frac{7}{8}+\frac{36}{8}\right)=255\)
\(\Rightarrow y.\frac{51}{8}=255\)
\(\Rightarrow y=255:\frac{51}{8}\)
\(\Rightarrow y=255.\frac{8}{51}\)
\(\Rightarrow y=40\)
Vậy \(y=40\)
~ Ủng hộ nhé
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
\(\dfrac{4}{51}\times y+y+y\times\dfrac{47}{51}=\dfrac{5}{4}+\dfrac{1}{6}\\y\times\left(\dfrac{4}{51}+1+\dfrac{47}{51}\right)= \dfrac{17}{12}\\ y\times2=\dfrac{17}{12}\\ y=\dfrac{17}{24}\)
\(a.\frac{Y}{3}=\frac{27}{Y}\Leftrightarrow\frac{Y^2}{3Y}=\frac{3.27}{3Y}\)
\(\Rightarrow Y^2=3.27=81\)
Do \(\orbr{\begin{cases}81=\left(-9\right)^2\\81=9^2\end{cases}\Rightarrow}\orbr{\begin{cases}Y=-9\\Y=9\end{cases}}\)
Vậy \(Y\in\left\{-9;9\right\}.\)
\(b.\frac{15}{Y}=\frac{Y}{9}\Leftrightarrow\frac{15.9}{Y.9}=\frac{Y^2}{9.Y}\)
\(\Rightarrow15.9=135=Y^2\)
Do \(\orbr{\begin{cases}135=\left(-\sqrt{135}\right)^2\\135=\sqrt{135}^2\end{cases}\Rightarrow}\orbr{\begin{cases}Y=-\sqrt{135}\\Y=\sqrt{135}\end{cases}}\)
Vậy \(Y\in\left\{-\sqrt{135};\sqrt{135}\right\}.\)
\(c.\frac{15}{48}:y=\frac{10}{4}\)
\(\Rightarrow y=\frac{15}{48}:\frac{10}{4}=\frac{1}{8}\)
Vậy \(y=\frac{1}{8}.\)
\(d.\frac{20}{y}.9=\frac{60}{135}\)
\(\Rightarrow\frac{20}{y}=\frac{60}{135}:9=\frac{20}{135}\)
\(\Leftrightarrow y=135\)
Vậy \(y=135.\)
\(e.\frac{16}{Y}=\frac{Y}{9}\Leftrightarrow\frac{16.9}{Y.9}=\frac{Y^2}{Y.9}\)
\(\Rightarrow16.9=144=Y^2\)
Do \(\orbr{\begin{cases}144=\left(-12\right)^2\\144=12^2\end{cases}\Rightarrow\orbr{\begin{cases}Y=-12\\Y=12\end{cases}}}\)
Vậy \(Y\in\left\{-12;12\right\}\)
\(g.\frac{25}{Y}=\frac{Y}{9}\Leftrightarrow\frac{25.9}{Y.9}=\frac{Y^2}{9.Y}\)
\(\Rightarrow25.9=225=Y^2\)
Do \(\orbr{\begin{cases}225=\left(-15\right)^2\\225=15^2\end{cases}\Rightarrow\orbr{\begin{cases}Y=-15\\Y=15\end{cases}}}\)
Vậy \(Y\in\left\{-15;15\right\}.\)
\(h.y-\frac{12}{42}=\frac{10}{12}\)
\(\Rightarrow y=\frac{10}{12}+\frac{12}{42}=\frac{47}{42}\)
Vậy \(Y=\frac{47}{42}.\)
\(i.y+\frac{5}{30}=\frac{18}{2}\)
\(\Rightarrow y=\frac{18}{2}-\frac{5}{30}=\frac{53}{54}\)
Vậy \(y=\frac{53}{54}.\)
mấy câu này gần như là giống nhau nên mik giải 1 câu rồi bạn dựa theo mà giải tiếp nha
y/3 = 27/y => y2 = 3 . 27
=> y2 = 81 => y = 9 hoặc -9
vậy .....
45,8-y+8,25=122,4:4
45,8-y+8,25=30,6
45,8-y=30,6-8,25
45,8-y=22,35
y=45,8-22,35
y=23,45
\(45,8-y+8,25=122,4:4\)
\(\Leftrightarrow45,8-y+8,25=30,6\)
\(\Leftrightarrow45,8-y=30,6-8,25\)
\(\Leftrightarrow45,8-y=22,35\)
Đến đây dễ rồi
y x 45,8 + y 44,2 + y x 9 + y = 46793,5
y x 45,8 + 44,2 + y x 9 + y x 1 = 46793,5
y x ( 45,8 + 44,2 + 9 + 1) = 46793,5
y x 100 = 46793,5
y = 46793,5 : 100
y = 467,935