sAU KHI GIAM:100

an:8 diem

hung:7diem

cuong:9diem

\(4x^2-3x-504=0\)

\(\Leftrightarrow4\left(x^2-\dfrac{3}{4}x-126\right)=0\)

\(\Leftrightarrow4\left(x^2-2.x.\dfrac{3}{8}+\dfrac{9}{64}-\dfrac{8073}{64}\right)=0\)

\(\Leftrightarrow4\left(x-\dfrac{3}{8}\right)^2-\dfrac{8073}{16}=0\)

\(\Leftrightarrow\left(x-\dfrac{3}{8}\right)^2=\dfrac{8073}{64}\)

\(\Leftrightarrow\left[{}\begin{matrix}x-\dfrac{3}{8}=\sqrt{\dfrac{8073}{64}}\\x-\dfrac{3}{8}=-\sqrt{\dfrac{8073}{64}}\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{3+3\sqrt{897}}{8}\\x=\dfrac{3-3\sqrt{897}}{8}\end{matrix}\right.\)

Số dư lớn nhất có thể là 5

Số đó là :27  *  6 = 162 + 5= 167

k mình nha

x + 2x + 3x +...+ 10x = -165

=> x(1 + 2 + 3 +...+ 10) = -165

=> x.55 = -165

=> x = x = -3