Toán Lớp 6: Tìm x
x+2017/2+x+2017/6+x+2017/12+x+2017/20
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Toán Lớp 6: Tìm x
x+2017/2+x+2017/6+x+2017/12+x+2017/20
Comments ( 2 )
(x+2017)(1/2+1/6+1/12+1/20)=0
(x+2017)(1/1.2+1/2.3+1/3.4+1/4.5)=0
(x+2017)(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5)=0
(x+2017).(1-1/5)=0
(x+2017).(5/5-1/5)=0
(x+2017). 4/5=0
x+2017=0:4/5
x+2017=0
x=0-2017
x=(-2017)
Vậy x=(-2017)