Răspuns:
Explicație pas cu pas:
a) 1-7/9+5/18
aduc la acelasi numitor 18
(18-7*2+5)/18=(18-14+5)/18=9/18=1/2
b) 5/6*3/10+3/4=
15/30+3/4=1/2+3/4
aduc la acelasi numitor 4
(2+3)/4=5/4
c) 21/25:14/5-1/5
21/25*5/14-1/5=3/10-1/5
aduc la acelasi numitor 10
(3-2*1)/5=1/5
d) (1 3/4 -1/6):19/3 +(5/2)^2
1 3/4=(1*4+3)/4=7/4
rezolv prima paranteza
7/4-1/6
aduc la acelasi numitor 12
(7*3-2*1)/12=(21-2)/12=19/12
19/12:19/3=19/12*3/19=3/12=1/4
(5/2)^2=25/4
deci avem
19/12+25/4
aduc la acelasi numitor 12
(19+25*3)/12=(19+75)/12=94/12=47/6 dupa simplificare cu 2
=7,8(3)
