Question

Tìm x , thuộc Z thỏa mãn :

/x+1/+/x+3/+/x+5/+/x+7/=5x

Answer 1

ta có:

x x 4+[1+3+5+7]=5x

x x 4+16=50+x

x x 4=50-16+x

x x 4=34+x

x x 4-x=34

x x [4-1]=34

x x 3=34

vậy x=34:3=11,33

Answer 2

x x4+[1+3+5+7]=5x

x x4+16=50+x

x x4=50-16+x

x x 4=34+x

x x4-x=34

x x[4-1]=34

x x 3=34

vậy x =34:3=11,33