tìm y:
y : 0,2 + y : 0,5 + y x 3 = 89,6
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a) \(\left(2,4-3x\right).0,5=0,9\)
\(2,4-3x=0,9:0,5\)
\(2,4-3x=1,8\)
\(3x=2,4-1,8\)
\(3x=0,6\)
\(x=0,6:3\)
\(x=0,2\)
b) \(\left(8,8x-50\right):0,4=51\)
\(8,8x-50=51.0,4\)
\(8,8x-50=20,4\)
\(8,8x=20,4+50\)
\(8,8x=70,4\)
\(x=70,4:8,8\)
\(x=8\)
c) \(\left(0,472-x\right):2=1,634\)
\(0,472-x=1,634.2\)
\(0,472-x=3,268\)
\(x=0,472-3,268\)
\(x=-2,796\)
d) \(1,6-\left(x-0,2\right)=6,5\)
\(x-0,2=1,6-6,5\)
\(x-0,2=-4,9\)
\(x=-4,9+0,2\)
\(x=-4.7\)
\(a.2,4-3x=1,8\)
\(3x=0,6\)
\(x=0,2\)
\(b.8,8x-50=20,4\)
\(8,8x=70,4\)
\(x=8\)
\(c.0,472-x=3,268\)
\(x=-2,796\)
\(d.x-0,2=-4,9\)
\(x=-4,7\)
Bổ sung thêm \(x,y\in Z\) thì mới làm đc
\(x\left(x-2\right)-\left(2-x\right)y-2\left(x-2\right)=3\\ \Leftrightarrow\left(x-2\right)\left(x+y-2\right)=3=3\cdot1=\left(-3\right)\left(-1\right)\)
Ta thấy \(x+y-2>x-2;\forall x,y\in Z\)
\(\Leftrightarrow\left\{{}\begin{matrix}x-2=1\\x+y-2=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=3\\y+1=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=3\\y=2\end{matrix}\right.\)
=>\(\dfrac{3}{x-5}-\dfrac{y}{3}=\dfrac{1}{6}\)
=>\(\dfrac{9-y\left(x-5\right)}{3\left(x-5\right)}=\dfrac{1}{6}\)
=>9-y(x-5)=1/2(x-5)
=>(x-5)(1/2+y)=9
=>(x-5)(2y+1)=18
=>\(\left(x-5;2y+1\right)\in\left\{\left(18;1\right);\left(-18;-1\right);\left(2;9\right);\left(-2;-9\right);\left(6;3\right);\left(-6;-3\right)\right\}\)
=>\(\left(x,y\right)\in\left\{\left(23;0\right);\left(-13;-1\right);\left(7;4\right);\left(3;-5\right);\left(11;1\right);\left(-1;-2\right)\right\}\)
y:0,2 + y:0,5 + y\(\times\) 3 = 89,6
y \(\times\) 5 + y \(\times\) 2 + y \(\times\) 3 = 89,6
y \(\times\) (5 + 2 + 3) = 89,6
y \(\times\) 10 = 89,6
y = 89,6 : 10
y = 8,96