Tìm x : \(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
\(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
tìm X
Ta có :
\(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
Áp dụng tính chất dãy tỉ số bằng nhau ta có :
\(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+2y+1+4y}{18+24}=\frac{2+6y}{42}=\frac{2\left(1+6y\right)}{2.21}=\frac{1+6y}{21}\)
Lại có :
\(\frac{1+6y}{6x}=\frac{1+6y}{21}\)
\(\Leftrightarrow\)\(6x=21\)
\(\Leftrightarrow\)\(x=\frac{7}{2}\)
Vậy \(x=\frac{7}{2}\)
Chúc bạn học tốt ~
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\(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
\(\Rightarrow\frac{1}{18}+\frac{2y}{18}=\frac{1}{24}+\frac{4y}{24}=\frac{1}{6x}+\frac{6y}{6x}\)
\(\Rightarrow\left(\frac{1}{18}+\frac{2y}{18}\right)-\left(\frac{1}{6x}+\frac{6y}{6x}\right)=0\)
\(\Rightarrow\frac{1}{18}+\frac{2y}{18}-\frac{1}{6x}-\frac{6y}{6x}=0\)
\(\frac{y}{9}-\frac{1}{6x}-\frac{6y}{6x}=\frac{1}{18}\)
\(\frac{\frac{2}{3}xy}{6x}-\frac{1}{6x}-\frac{6y}{6x}=\frac{1}{18}\)
\(\frac{\frac{2}{3}xy-1-6y}{6x}=\frac{1}{18}\)
\(6x=\left(\frac{2}{3}xy-1-6y\right)\cdot\frac{1}{18}\)
\(x=\frac{\left[\left(\frac{2}{3}xy-1-6y\right)\cdot\frac{1}{18}\right]}{6}\)
\(x=\left(\frac{\frac{\frac{2}{3}xy-1-6y}{18}}{6}\right)\)
\(x=\frac{\frac{2}{3}xy-1-6y}{108}\)
Tìm x biết \(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
Tìm x biết \(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
ta có: \(\frac{1+2y}{18}=\frac{1+4y}{24}\)
\(\Rightarrow\left(1+2y\right).24=18.\left(1+4y\right)\)
\(24+48y=18+72y\)
\(48y-72y=18-24\)
\(-24y=-6\)
\(y=\frac{1}{4}\)
thay vào \(\frac{1+4.\frac{1}{4}}{24}=\frac{1+6.\frac{1}{4}}{6x}\)
\(\frac{1+1}{24}=\frac{1+\frac{3}{2}}{6x}\)
\(\frac{1}{12}=\frac{5}{2}:6x\)
\(6x=\frac{5}{2}:\frac{1}{12}\)
\(6x=30\)
\(x=30:6\)
\(x=5\)
KL: x =5; y = 1/4
tìm x
\(\frac{1+2y}{18}=\frac{1+4y}{24}+\frac{1+6y}{6x}\)
Tìm x biết rằng ; \(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
\(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}=\frac{1+2y+1+6y}{18+6x}=\frac{2+8y}{6\left(3+x\right)}=\frac{1+4y}{3\left(3+x\right)}\)
\(\Rightarrow3\left(3+x\right)=24\)\(\Rightarrow3+x=8\)\(\Rightarrow x=5\)
Vậy \(x=5\)
Ta có: \(\frac{1+2y}{18}=\frac{1+4y}{24}\)
\(\Leftrightarrow24\left(1+2y\right)=18\left(1+4y\right)\)
\(\Leftrightarrow24+48y=18+72y\)
\(\Leftrightarrow24y-6=0\Leftrightarrow y=\frac{1}{4}\)
\(\Rightarrow\frac{1+2y}{18}=\frac{1+6y}{6x}\Leftrightarrow\frac{1+\frac{1}{2}}{18}=\frac{1+\frac{3}{2}}{6x}\)
\(\Leftrightarrow x=5\)
Vậy x = 5 và \(y=\frac{1}{4}\)
Tìm x biết:
\(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
1 + 2y/18=1 + 6y/6x=1 + 2y + 1 + 6y/18 + 6x=2 + 8y/18 + 6x=2.(1 + 4y)/2.(9 + 3x)=1 + 4y/9 + 3x
Suy ra:1 + 4y/9 + 3x=1 + 4y/24=>9 + 3x=24
3x=15
x=5
Tìm x biết rằng \(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
\(\Rightarrow\)\(\frac{1+2y+1+4y+1+6y}{18+24+6x}\)=\(\frac{\left(1+1+1\right)+2y+4y+6y}{6\left(3+4+x\right)}=\frac{y\left(2+4+6\right)+3}{6\left(3+4+x\right)}=\frac{3+y.12}{6\left(7+x\right)}\)
=\(\frac{3\left(1+4y\right)}{3.2\left(7+x\right)}=\frac{1+4y}{14+2x}\)
\(\Rightarrow\)\(\frac{1}{14}=\frac{2y}{x}\Rightarrow x=14.2y=28y\)
\(\frac{x}{y}=28\)
Tìm x, biết rằng : \(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
Ta có: \(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}=\frac{1+2y+1+6y}{18+6x}=\frac{2\left(1+4y\right)}{6\left(x+3\right)}=\frac{1+4y}{3x+9}\)
\(=>\frac{1+4y}{24}=\frac{1+4y}{3x+9}\)\(=>3x+9=24\)
<=>3x=15
<=>x=5
Vậy x có giá trị bằng 5
Chúc bạn học tốt!
\(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{2+6y}{6x}\)
tìm x
Trả lời:
\(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{2+6y}{6x}\)\(\left(Đk:x\ne0\right)\)(1)
\(\Rightarrow\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{2+6y}{6x}=\frac{1+2y+1+4y}{18+24}=\frac{2+6y}{42}\)(Tính chất dãy tỉ số bằng nhau)
\(\Rightarrow\frac{2+6y}{42}=\frac{2+6y}{6x}\)
+ Nếu \(2+6y=0\)
\(\Rightarrow y=\frac{-1}{3}\)
Khi đó (1) có dạng:
\(\frac{1+2.\frac{-1}{3}}{18}=\frac{1+4.\frac{-1}{3}}{24}=0\)
\(\Leftrightarrow\frac{1+\frac{-2}{3}}{18}=\frac{1+\frac{-4}{3}}{24}=0\)
\(\Leftrightarrow\frac{\frac{1}{3}}{18}=\frac{\frac{-1}{3}}{24}=0\left(vl\right)\)
\(\Rightarrow y\ne\frac{-1}{3}\)
+ Nếu \(2+6y\ne0\)
\(\Rightarrow6x=42\)
\(\Rightarrow x=7\)(Thỏa mãn Đk:\(x\ne0\))
Vậy \(x=7\)
Hok tốt!
Good girl
MÌnh nghxi đề sai . mình nghĩ thế này mới đúng
\(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)
Ta có\(\frac{1+2y}{18}=\frac{1+4y}{24}=>24+48y=18+72y\)
\(=>y=\frac{1}{4}\left(#\right)\)
ta lại có \(\frac{1+4y}{24}=\frac{1+6y}{6x}=>6x+24xy=24+144y\)
thay (#) zô ta được .\(6x+6x=60=>x=5\)
Bài giải
Ta có :
\(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{2+6y}{6x}=\frac{1+2y+1+4y-2-6y}{18+24-6x}=\frac{2+6y-2-6y}{42-6x}=0\)
( Áp dụng tính chất của dãy tỉ số bằng nhau )
\(\Rightarrow\text{ }x\ne0\text{ }\)