a) (1/3+1/4)*6/7= aducem la acelasi numitor comun in paranteza pentru ca prima oparatie este efectuarea parantezei
numitorul comun este 12
4+3/12)*6/7=7/12*6/7=1/2
b) (3/2-5/6)*9/9=
9-5/6)*9/4=4/6*9/4=3/2
c) (13/9-7/6)*3/4=
26-21/18)*3/4=5/18*3/4=15/72
d) (5/12-3/8)*12/5=
10-9/24)*12/5=1/24*12/5=1/10
e) (6/5-3/4)*(2/3+2/7)=
24-15/20)*(14+6/21)=
9/20*20/21=9/21
f) (8/3-5/2)*(7/5-1/2)=
16-15/6)*(14-5/10)=
1/6*9/10=3/20
g) (12/7-3/2):(1/3-1/7)=
24-21/14):(7-3/21)=
3/14:4/21=
3/14*21/4=63/56
