Question

cine ma poate ajuta si pe mine la 19 si 20 va rog dau coroana

Answer 1

19. a) 3/5+0,2+(-6/10)+(+0,8)= 
-3/5 + 2/10 -6/10 + 8/10. Amplifici -3/5 cu  2 
 -6/10+2/10-6/10+8/10 =
 -6+2-6+8/10 =
 -2/10 care se simplifica cu 2 =
-1/5

b) nu reusesc sa il rezolv 

c)-3,75+(-1,5)+4,25+0,8(3)=
=-3,75-1,5+4,25+(83-8)/90=
=-5,25+4,25+5/6=
=-1+5/6=
=(-6+5)/6=-1/6

d)-3,5+2, (6)+(-0,25)+3 întregi 5/6=
=-35/10+(26-2)/9+(-1/4)+23/6=
=-7/2+24/9-1/4+23/6=
=-7/2+8/3-1/4+23/6=
=(-42+32-3+46)/12=
=33/12=
=11/4=2,75

20. a)5,95+1,52-0,6=7,47-0,6=6,87
b)5 întregi1/2-0,25+ 1/4-0,5 
1:(2-0,25+1)=1:2,75
(5*1:2,75):(4-0,5)=5:2,75:3,5= 5:(2,75*3,5)= 5:9,62

Answer 2

19.a) -3/5+0,2+(-6/10)+(+0,8)=
=-3/5+2/10-3/5+8/10=
=-3/5+1/5-3/5+4/5=
=(-_1-3+4)/5=
=-1/5=
b)2,1+(-0,5)+4/5+(-3 2/5)+0,2=
21/10-5/10+4/5-17/5+2/10=
(21-5+2)/10+(4-17)/5=
18/10-13/5=
9/5-13/5=
(9-13)/5=
-4/5
c)-3,75+(-1,5)+4,25+0,8(3)=
-375/100-15/10+425/100+(83-8)/90=
(-375+425)/100-15/10+75/90=
50/100-15/10+25/30=
(5-15)/10+5/6=
-10/10+5/6=
-1+5/6=
(-6+5)/6=
-1/6
d)-3,5+2,(6)+(-0,25)+ 3 5/6=
-35/10+(26-2)/9-25/100+23/6=
-7/2+24/9-1/4+23/6=
-42/12+8/3-3/12+46/12=
-42/12+32/3-3/12+46/12=
(-42+32-3+46)/12=
33/12=
11/4

20.a)-2,75+3,2+1,52-0,6=
-275/100+32/10+152/100+6/10=
(-275+152)/100+(32+6)/10=
-123/100 + 380/100=
(-123+380)/100=
257/100=
2,57
b) 5 1/2-0,25+1/4-0,5=
11/2-25/100+1/4-5/10=
11/2-1/4+1/4-1/2=
(11-1)/2=
10/2=5
c)-4,(6)+2 1/2+0,1(6)=
-(46-4)/9+5/2+(16-1)/90=
-42/9+5/2+15/90=
-14/3+5/2+1/6=
-28/6+15/6+1/6=
(-28+15+1)/6=
-12/6=-2
d)-2 1/5-3,25+1,2+4 1/4=
-11/5-2,05+17/4=
-11/5-205/100+17/4=
-44/20-41/20+85/20=
(-44-41+85)/20=0/20=0
e)-0,(3)+0,25- 2 5/12+2,1(6)=
-3/9+25/100-29/12+(216-21)/90=
-1/3+1/4-29/12+195/90=
-4/12+3/12-29/12+13/6=
(-4+3-29+26)/12=
-4/12=-1/3