Môn Toán Lớp 4: x + 1/2 +x + 1/3+ x + 1/4 +x +1/5 = 103/45

$x^{}$ $=^{}$ $\dfrac{181}{720}$

$x^{}$ $+^{}$ $\dfrac{1}{2}$ $+^{}$ $x^{}$ $+^{}$ $\dfrac{1}{3}$ $+^{}$ $x^{}$ $+^{}$ $\dfrac{1}{4}$ $+^{}$ $x^{}$ $+^{}$ $\dfrac{1}{5}$ $=^{}$ $\dfrac{103}{45}$

$⇔^{}$ $(^{}$ $x^{}$ $+^{}$ $x^{}$ $+^{}$ $x^{}$ $+^{}$ $x^{}$ $)^{}$ $+^{}$ $(^{}$ $\dfrac{1}{2}$ $+^{}$ $\dfrac{1}{3}$ $+^{}$ $\dfrac{1}{4}$ $+^{}$ $\dfrac{1}{5}$ $)^{}$  $=^{}$ $\dfrac{103}{45}$

$⇔^{}$ $4x^{}$ $+^{}$ $\dfrac{77}{60}$ $=^{}$ $\dfrac{103}{45}$

$⇔^{}$ $4x^{}$ $=^{}$ $\dfrac{103}{45}$ $-^{}$ $\dfrac{77}{60}$

$⇔^{}$ $4x^{}$ $=^{}$ $\dfrac{181}{180}$

$⇔^{}$ $x^{}$ $=^{}$ $\dfrac{181}{720}$