Calculati suma si diferenta numerelor x si y unde :
a) x= -2 1/7- (-3 3/14 ) - (+1 1/2) ; y= 1/2 - (-3/7) - (+1/14) ;
b) x=5/8 - (+3/16)-(-7/48)-(+1/12) ; y=-1/6 + (-7/24)-(-9/4) ;
c) x=2 1/81 - (+1 1/3) - (-4 4/9) ; y= -4 2/3 - (+7/27)- 1/9 ;

unde scriu = -2 1/7 =) -2 inseamna doi intregi iar fractia este negativa - (2x7+1)

VA ROG URGENT !!!!