Question

Daca se poate cat mai detaliat va rog :d

a) 25,3 + 0,7 - 21,(83) - 16/99=
b) 2,71 - 0,8(2) + 1,2(5) + 8/5 - 0,65(4)=
c) 17/3 * 12/34 * (- 9/2)=
d) -3/8 : 16/6 =
e) 12/49 : (-4/ 96)=

Answer 1

a) 25,3+0,7-21,(83)-16/99= 26-(2162/99+16/99=26-2178/99=26-22=4
21,(83)=(2183-21)/99=2162/99

b) 2,71 - 0,8(2) + 1,2(5) + 8/5 - 0,65(4)=
= 2,71 - 74/90 + 113/90 + 1,6 -589/900=
=4,31-(740-1130+589)/900=4,31-199/900=(3879-199)/900=3680/900=368/90=184/45=4,0(8)
0,8(2)=(82-8)/90=74/90
1,2(5)=(125-12)/90=113/90
0,65(4)=(654-65)/900 =589/900


c) 17/3 * 12/34 * (- 9/2)=
=17*12/3*34 *(-9/2)=     se simplifica cu 17 apoi cu  3 si apoi cu 2
=2 *(-9/2)=-9

d) -3/8 : 16/6 = -3/8 : 8/3=-3/8 * 3/8=-9/64=

e) 12/49 : (-4/ 96)= 12/49 *(-96/4)=-3*96/49=288/49