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\(\frac{57}{76}=\frac{306}{y-15}\)
\(\Rightarrow57\times\left(y-15\right)=76\times306\)
\(\Rightarrow57\times\left(y-15\right)=23256\)
\(\Rightarrow y-15=23256:57\)
\(\Rightarrow y-15=408\)
\(\Rightarrow y=408+15\)
\(\Rightarrow y=423\)
Vậy \(y=423\)
1/2 x y + 1/3 x y + 1/4 x y = 11/4
y x ( 1/2 + 1/3 + 1/4 ) = 11/4
y x 13/12 = 11/4
y = 11/4 : 13/12
y = 11/4 x 12/13
y = 33/13
^^ Học tốt!
\(\frac{1}{2}\times Y+\frac{1}{3}\times Y+\frac{1}{4}\times Y=\frac{11}{4}\)
\(3Y=\frac{11}{4}\div\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}\right)\)
\(3Y=\frac{33}{13}\)
\(Y=\frac{33}{13}\div3\)
\(Y=\frac{11}{13}\)
~ Chúc bạn học tốt
x-2\(\frac{1}{4}\)=3\(\frac{1}{2}\)
x-\(\frac{9}{4}\)=\(\frac{7}{2}\)
x = \(\frac{7}{2}\)+\(\frac{9}{4}\)
x = \(\frac{23}{4}\)
các câu còn lại, bạn tự làm nhé
X - 2 1/4 = 3 1/2 X + 2 3/4 = 5 2/3 3 1/2 : X = 1 3/5 X : 1 1/2 = 2 2/5
X - 9/4 = 7/2 X + 11/4 = 17/3 7/2 : X = 8/5 X : 3/2 = 12/5
X = 7/2 + 9/4 X = 17/3 - 11/4 X = 7/2 : 8/5 X = 12/5 x 3/2
X = 13/4 X = 35/12 X = 35/16 X = 18/5
Nhớ tíck cho mik nha
Sai chỗ nào thì bảo mik
\(7-\left(11+x-13\right)\div2\frac{2}{3}=2\)
\(\left(11+x-13\right)\div2\frac{2}{3}=7-2\)
\(\left(11+x-13\right)\div2\frac{2}{3}=5\)
\(11+x-13=\frac{40}{3}\)
\(11+x=\frac{79}{3}\)
\(x=\frac{46}{3}\)
(11+x-13):\(2\frac{2}{3}\)=7-2
(11+x-3):\(\frac{8}{3}\)=5
11+x-3 =5 * \(\frac{8}{3}\)
11+x-3=\(\frac{40}{3}\)
x-3=\(\frac{40}{3}\) -11=\(\frac{40}{3}\) -\(\frac{33}{3}\)
x-3=\(\frac{7}{3}\)
x=\(\frac{7}{3}\) +3=\(\frac{7}{3}\)+\(\frac{9}{3}\)
x=\(\frac{16}{3}\)=\(5\frac{1}{3}\)
7 - ( 11 + x - 13 ) = 2 x \(\frac{8}{3}\)
7 - ( 11 + x - 13 ) = \(\frac{16}{3}\)
11 + x - 13 = 7 - \(\frac{16}{3}\)
11 + x - 13 = \(1\frac{2}{3}\)
11 + x = \(1\frac{2}{3}\)+ 13
11 + x = \(14\frac{2}{3}\)
x = \(14\frac{2}{3}-11\)
x = \(3\frac{2}{3}\)
Vậy x = \(\frac{11}{3}nha\)!!!
\(\frac{57}{76}=\frac{306}{y-15}\)
y = 306 : 57 x 76 + 15
y = 423.
<=>57x(y-15)=76x306
<=>57x(y-15)=23256
<=>y-15=23256:57
<=>y-15=408
<=>y=408+15
<=>y=423