tìm x,y
a, x*6=4,08+2,28 b, x:4-8,1=10,4
c, 2/9+y=1 d,x-1/2=5/
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a) 240:x+118=178
240:x=178-118
240:x=60
x= 240:60
x= 4
b) 2/9 +x= 1
x= 1 -2/9
x=7/9
c) x* 6-4,08=2,28
x*6= 2,28 + 4,08
x*6= 6,36
x= 6,36: 6
x=1,06
d) x:4 -8,1=10,2
x:4 = 10,2 +8,1
x:4=18,3
x= 18,3 * 4
x=73,2
a) 240 : x + 118 = 178
240 : x = 178 - 118
240 : x = 60
x = 240 : 60
x = 4
X x 6 = 9,36 X : 4 = 10,4+8,1
X = 9,36 : 6 X :4 = 18,5
X = 1,56 X = 18,5 x 4
X= 74
y = 1\(-\frac{2}{9}\) X\(=\frac{5}{3}+\frac{1}{2}\)
y = \(\frac{7}{9}\) X=\(\frac{13}{6}\)
a, y x 6 = 6,36
y = 6,36 : 6 = 1,06
b, 4,7 - x = 2,1
x = 4,7 - 2,1 = 2,6
k mk nha
a, y x 6 = 6,36 b, 4,7 - x = 2,1
y = 6,36 : 6 x = 4,7 - 2,1
y = 1,06 x = 2,6
a) \(\left(3x-5\right)\left(5-3x\right)+9\left(x+1\right)^2=30\)
\(\Rightarrow15x-9x^2-25+15x+9\left(x^2+2x+1\right)-30=0\)
\(\Rightarrow30x-9x^2-25+9x^2+18x+9-30=0\)
\(\Rightarrow48x-46=0\)
\(\Rightarrow x=\frac{23}{24}\)
b) \(\left(x+4\right)^2-\left(x+1\right)\left(x-1\right)=16\)
\(\Rightarrow\left(x^2+8x+16\right)-\left(x^2-1\right)=16\)
\(\Rightarrow x^2+8x+16-x^2+1=16\)
\(\Rightarrow8x+17=16\)
\(\Rightarrow8x=-1\)
\(\Rightarrow x=\frac{-1}{8}\)
c) \(\left(y-2\right)^3-\left(y-3\right)\left(y^2+3y+9\right)+6\left(y+1\right)^2=49\)
\(\Rightarrow\left(y-2\right)^3-\left(y^3-3^3\right)+6\left(y^2+2y+1\right)=49\)
\(\Rightarrow y^3-6y^2+12y-8-y^3+27+6y^2+12y+6=49\)
\(\Rightarrow\left(y^3-y^3\right)+\left(-6y^2+6y^2\right)+\left(12y+12y\right)+\left(-8+27+6\right)=49\)
\(\Rightarrow24y+25=49\)
\(\Rightarrow24y=24\)
\(\Rightarrow y=1\)
d) \(\left(y+3\right)^3-\left(y+1\right)^3=56\)
\(\Rightarrow\left(y+3-y-1\right)[\left(y+3\right)^2+\left(y+3\right)\left(y+1\right)+\left(y+1\right)^2]=56\)
\(\Rightarrow2\left(y^2+6y+9+y^2+4y+3+y^2+2y+1\right)=56\)
\(\Rightarrow3y^2+12y+13=28\)
\(\Rightarrow\left(3y^2+15y\right)-\left(3y+15\right)=0\)
\(\Rightarrow3y\left(y+5\right)-3\left(y+5\right)=0\)
\(\Rightarrow3\left(y-1\right)\left(y+5\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-1=0\\x+5=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=1\\x=-5\end{cases}}\)
a) \(x.6=4,08+2,28\)
\(\Leftrightarrow x.6=6,36\)
\(\Leftrightarrow x=6,36:6\)
\(\Leftrightarrow x=1,06\)
Vậy x = 1,06
b) \(x:4-8,1=10,4\)
\(\Leftrightarrow x:4=10,4+8,1\)
\(\Leftrightarrow x:4=18,5\)
\(\Leftrightarrow x=18,5.4\)
\(\Leftrightarrow x=74\)
Vậy x = 74
c) \(\frac{2}{9}+y=1\)
\(\Leftrightarrow y=1-\frac{2}{9}\)
\(\Leftrightarrow y=\frac{7}{9}\)
Vậy y = \(\frac{7}{9}\)
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