Question

[Mai Tran]

Tìm x thuộc Z, biết 

a, -5/7 + 1 + 30/-7 <_ x <_ -1/6 + 1/3 + 5/6 

b, 1/2 - ( 1/3 + 1/4 ) < x < 1/48 - ( 1/16 - 1/6 ) 

c,  ( x - 1/2 ) × ( x + 3/4 ) < 0 

d,  3/( x + 2) × ( x + 5 ) + 5/( x+5 ) × ( x +10) + 7/( x+10) × ( x+17) = x/( x+2) × ( x+17)