\(\frac{148-x}{25}+\frac{179-x}{23}+\frac{206-x}{21}+\frac{229-x}{19}=10\)
\(\Leftrightarrow\frac{148-x}{25}-1+\frac{179-x}{23}-2+\frac{206-x}{21}-3+\frac{229-x}{19}-4=0\)
\(\Leftrightarrow\frac{148-25-x}{25}+\frac{179-46-x}{23}+\frac{206-63-x}{21}+\frac{229-76-x}{19}=0\)
\(\Leftrightarrow\frac{123-x}{25}+\frac{133-x}{23}+\frac{143-x}{21}+\frac{153-x}{19}=0\)
Tới đây bn tự làm tiếp
đề phải là: \(\frac{148-x}{25}+\frac{169-x}{23}+\frac{196-x}{21}+\frac{219-x}{19}\)