a, 12 + |2x - 5| = 21
=> |2x - 5| = 9
=> \(\orbr{\begin{cases}2x-5=9\\2x-5=-9\end{cases}}\)
=> \(\orbr{\begin{cases}2x=14\\2x=-4\end{cases}}\)
=> \(\orbr{\begin{cases}x=7\\x=-2\end{cases}}\)
b, 9 - |x| = 0
=> |x| = 9
=> \(\orbr{\begin{cases}x=9\\x=-9\end{cases}}\)
~Study well~
giai cac phuong trinh va bat phuong trinh sau:
2(x-1)-5=3(5-3x)
giai bat phuong trinh \(\sqrt{x+2x^2}\)+\(\sqrt[3]{x+4x^3}\ge\)5-2x-\(\frac{1}{x}\)
\(\hept{\begin{cases}1\le|5x-4|\le3\\\frac{x+1}{2}>\frac{2x+6}{3}\end{cases}}\)GIAI HE BAT PHUONG TRINH
a) Cho phuong trinh x2 +mx+1=0. Tim dieu kien cua m de phuong trinh co nghiem kep. Tinh nghiem kep do
b) Khong giai phuong trinh, chung to phuong trinh 2x2 - 3x - 5 = 0co 2 nghiem phan biet x1 , x2. Tinh ( x1 - x2 )
giai phuong trinh
\(18x^2-2x-\frac{17}{3}+9\sqrt{x-\frac{1}{3}}=0\)
giai phuong trinh
\(2x^2+x+5=0\)
\(2x^2-2x+8=0\)
giai phuong trinh
\(\left(2x-1\right)^2=12\sqrt{x^2-x-2}-1\)
Giai cac phuong trinh sau
a)x^2- 10=0
b)2x^2- 6=0
c)x^2- can bac 5=0
Giai bat phuong trinh sau: căn x^2-3x+10<hoac bang x-2
