Question

[buitrinhtienhoang]

Tìm x,biết:

x+2015/5 + x+2014/6 = x+2017/3 + x+2018/2

Hướng dẫn: x+2015/5+1 + x+2014/6+1 = x+2017/3+1 + x+2018/2+1

Answer 1

[Phạm Quỳnh Trang]

=> (x+2020)/5=(x+2020)/6=(x+2020)/3+(x+2020)/2

=>(x+2020)(1/5+1/6)=(x+2020)(1/3+1/2)

Với x+2020=0=>x=-2020

Với x+2020 khác 0=>1/5+1/6=1/3+1/2 ,vô lí 

Vậy x=-2020