Toán x+ 4/9.13 + 4/13.17 + 4//17.21 + …… + 4/41.45 = 10 09/09/2021 By Charlie x+ 4/9.13 + 4/13.17 + 4//17.21 + …… + 4/41.45 = 10
Giải thích các bước giải: $x + \dfrac{4}{9.13} + \dfrac{4}{13.17} + \dfrac{4}{17.21} + … + \dfrac{4}{41.45} = 10$ $x + \dfrac{1}{9} – \dfrac{1}{13} + \dfrac{1}{13} – \dfrac{1}{17} + … + \dfrac{1}{41} – \dfrac{1}{45} = 10$ $x + \dfrac{1}{9} – \dfrac{1}{45} = 10$ $x + \dfrac{4}{45} = 10$ $x = 10 – \dfrac{4}{45}$ $x = \dfrac{446}{45}$ Trả lời
x+$\frac{4}{(9.13)}$ +$\frac{4}{(13.17)}$+$\frac{4}{(17.21)}$+…+$\frac{4}{(41.45}$ = 10 =>x+ ($\frac{4}{(9.13)}$ +$\frac{4}{(13.17)}$+$\frac{4}{(17.21)}$+…+$\frac{4}{(41.45}$ )= 10 =>x+( $\frac{1}{9}$ -$\frac{1}{13}$ +$\frac{1}{13}$ -$\frac{1}{17}$+..+$\frac{1}{41}$+$\frac{1}{45}$ )= 10 =>x+ ($\frac{1}{9}$-$\frac{1}{45}$ )= 10 =>x+ $\frac{4}{45}$= 10 =>x=9 $\frac{41}{45}$ Trả lời
Giải thích các bước giải:
$x + \dfrac{4}{9.13} + \dfrac{4}{13.17} + \dfrac{4}{17.21} + … + \dfrac{4}{41.45} = 10$
$x + \dfrac{1}{9} – \dfrac{1}{13} + \dfrac{1}{13} – \dfrac{1}{17} + … + \dfrac{1}{41} – \dfrac{1}{45} = 10$
$x + \dfrac{1}{9} – \dfrac{1}{45} = 10$
$x + \dfrac{4}{45} = 10$
$x = 10 – \dfrac{4}{45}$
$x = \dfrac{446}{45}$
x+$\frac{4}{(9.13)}$ +$\frac{4}{(13.17)}$+$\frac{4}{(17.21)}$+…+$\frac{4}{(41.45}$ = 10
=>x+ ($\frac{4}{(9.13)}$ +$\frac{4}{(13.17)}$+$\frac{4}{(17.21)}$+…+$\frac{4}{(41.45}$ )= 10
=>x+( $\frac{1}{9}$ -$\frac{1}{13}$ +$\frac{1}{13}$ -$\frac{1}{17}$+..+$\frac{1}{41}$+$\frac{1}{45}$ )= 10
=>x+ ($\frac{1}{9}$-$\frac{1}{45}$ )= 10
=>x+ $\frac{4}{45}$= 10
=>x=9 $\frac{41}{45}$