Toán Lớp 7: $\frac{x-1}{2018}$ + $\frac{x-1}{2019}$ = $\frac{x-1}{2020}$ – $\frac{x-1}{2021}$
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Toán Lớp 7: $\frac{x-1}{2018}$ + $\frac{x-1}{2019}$ = $\frac{x-1}{2020}$ – $\frac{x-1}{2021}$
Comments ( 2 )
=>(x-1)/2018+(x-1)/2019-(x-1)/2020+(x-1)/2021=0
=>(x-1).(1/2018+1/2019-1/2020+1/2021)=0
=>x-1=0 ( vì 1/2018+1/2019-1/2020+1/2021\ne0)
=>x=0+1
=>x=1
Vậy x=1