Question

Am si eu cateva calcule:
a)0,(5)+0,(4)=
b)0,(35)+0,(13)=
c)0,(7)+0,(51)=
d)0,(75)+2,(5)=
e)12,3(4)+0,5(6)=
f)2,5(15)+3,(21)=
g)0,(135)+0,(531)=
h)7,(8)-3,4(5)=

Answer 1

a)0,(5)+0,(4)=5/9+4/9=9/9=1
b)0,(35)+0,(13)=35/99+13/99=48/99=16/33=0,(48)

c)0,(7)+0,(51)=7/9+51/99=7/9+17/33=(7x11+17x3)/297=128/99=1,(29)

d)0,(75)+2,(5)=75/99+(25-2)/9=25/33+23/9=(25x3+23x11)/99=328/99=3,(31)

e)12,3(4)+0,5(6)=(1234-123)/90+(56-5)/90
=1111/90+51/90=1162/90=581/45=12,9(1)

f)2,5(15)+3,(21)=(2515-25)/990+(321-3)/99=2490/990+318/99=(2490+3180x10)/990=(2490+3180)/990=5670/990=567/99=189/33=63/11=5,(72)

g)0,(135)+0,(531)=(135/999+531/999=666/999=222/333=0,(6)

h)7,(8)-3,4(5)=(78-7)/9-(345-34)/90=71/9-311/90=(71x10-311)/90=
(710-311)/90=399/90=133/30=4,4(3)