Răspuns:
Explicație pas cu pas:
a)=(7+2+5)/13=14/13
b) =(-10+11)/9-7/9·18/21-7/9=1/9-6/9-7/9=-12/9
c)-3/5-5/6+1/2+4/15 numitor comun=30
=(-6·3-5·5+15+4·2)/30=(-43+23)/30=-20/30=-2/3
d)(13-5)/18-14/5-7/30=4/9-14/5-7/30= numitor comun=9·10=90
=(4·10-14·6-7·3)/90=(40-84-21)/90=-65/90=-13/4
