Question

E urgent! Ajutați-ma, va rog!

Answer 1

Răspuns:

Explicație pas cu pas:

a) 0,2-1,(3)-0,1(3)=2/10-(13-1)/9-12/90= 2/10-12/9-12/90=(18-120-12)/90=-114/90=-38/30

b) 1,(6)-[-0,8(3)]-0,(2)=(16-1)/9+(83-8)/90-2/9=15/9+75/90-2/9=(150+75-20)/90=205/90=41/18

c) -2,25-(-0,125)-1,5=-2,25+0,125-1,5=-3,625

d) 2-3 1/3+1/2= 2-10/3+1/2=(12-20+3)/6=-5/6

e) 5/6-(-1,5+2)=5/6-0,5=5/6-1/2=(5-3)/6=2/6=1/3

f) -1,(3)+(-5 1/3+4,8)=-(13-1)/9-(-16/3+48/10)=-12/9-(-160+144)/30= -12/9+16/30= -4/3+16/30=(-40+16)/30=-24/30=-4/5

g) 2 1/3-[-7-0,(6)]=7/3-[-7-6/9]=7/3-(-7-2/3)=7/3-(-21-2)/3=7/3+23/3=30/3=10

h) -3-[-1/2-(7-8 1/4)]=-3-[-1/2-(7-33/4)]=-3-[-1/2-(7·4-33)/4]=-3-[-1/2-(-5/4)]=

-3-[-1/2+5/4]=-3-(-2+5)/4]=-3-3/4=(-3·4-3)/4=(-12-3)/4=-15/4

i) -2,4-[1/10-(-2 1/5-1/2)]=-24/10-[1/10-(-11/5-1/2)]=-24/10-(-22-5)/10=-24/10-(-27/10)=-24/10+27/10=3/10