Gọi 1/4 số a là 0,25 . Ta có :
a . 3 - a . 0,25 = 147,07
a . (3 - 0,25) = 147,07 ( 1 số nhân 1 hiệu )
a . 2,75 = 147,07
a = 147,07 : 2,75
a = 53,48
\(\hept{\begin{cases}x^2+2y-4x=0\\4x^2-4xy^2+y^4-2y+4=0\end{cases}}\)
\(\Leftrightarrow x^2+2y-4x=4x^2-4xy^2+y^4-2y+4\)
\(\Leftrightarrow2y+2y-4x=4x^2-x^2-4xy^2+y^4+4\)
\(\Leftrightarrow4y-4x=3x^2-y^2\left(4x-y^2\right)+4\)
\(\Leftrightarrow4y-4x-4=3x^2-y^2\left(4x-y^2\right)\)
\(\Leftrightarrow4\left(y-x-1\right)=3x^2-y^2\left(4x-y^2\right)\)
\(\Leftrightarrow4\left(y-x-1\right)=0\)
\(\Leftrightarrow y-x-1=\frac{0}{4}\)
\(\Leftrightarrow y-x-1=0\)
\(\Leftrightarrow y-x=0+1\)
\(\Leftrightarrow y-x=1\)
Vậy \(\hept{\begin{cases}y=x+1\\x=y-1\end{cases}}\)