$\frac{148 - x}{25}$ + $\frac{169 - x}{23}$ + $\frac{186 - x}{21}$ + $\frac{199 - x}{19}$ ${=}$ 10

$\frac{148 - x}{25}$ ${-}$ 1 ${+}$ $\frac{169 - x}{23}$ ${-}$ 2 ${+}$ $\frac{186 - x}{21}$ ${-}$ 3 ${+}$ $\frac{199 - x}{19}$ ${-}$ 4 ${=}$ 0

$\frac{148 - x - 25}{25}$ ${+}$ $\frac{169 - x - 46}{23}$ ${+}$ $\frac{186 - x - 63}{21}$ ${+}$ $\frac{199 - x - 76}{19}$ ${=}$ 0 

$\frac{123 - x}{25}$ ${+}$ $\frac{123 - x}{23}$ ${+}$ $\frac{123 - x}{21}$ ${+}$ $\frac{123 - x}{19}$ ${=}$ 0

$(123 - x)$ ($\frac{1}{25}$ ${+}$ $\frac{1}{23}$ ${+}$ $\frac{1}{21}$ ${+}$ $\frac{1}{19}$) ${=}$ 0

${123}$ ${-}$ ${x}$ ${=}$ 0

${x}$ ${=}$ ${123}$

Vậy phương trình có nghiệm là ${x}$ ${=}$ ${123}$

#trannhalinh676