Question

Ajutor ex 19 si 20 repede dau coroana si inima

Answer 1

19. a=555:15 -2[81-9(56:7-0·2014)]-1

 a= 37 -2[81-9(8-0)]-1

a= 37 -2(81-72)-1

a=37-2·(9)-1

a=37-18-1

a=18

b=432:(18·28-90·5):4

b=432:(504-450):4

b=432:(54):4

b=8:4

b=2

a+b=18+2=20

a:b=18:2=9

20. a) x=470:5

         x=94

 b)x=360:24

x=15

c) x=625:25

x=25

d)=x=714:42

x=17

e) x=1363:29

x=47

f)x=3026:34

x=89

Answer 2

Răspuns:

19)a=555:15-2[81-9(56:7-0×2014) ]-1

=37-2[72(8-0) ]

=35×(72×8) -1

=35×576-1

=20160-1

=20159

b=432;(18×28-90×5) :4

=432:(504-450) :4

=432:54:4

=8:4

=2

20159+2=20161(suma)

20159:2=100784 rest 5(cât)

20) a) 470:x=5

x=470:5

x=94

b) 360:x=24

x=360:24

x=15

c) 25x=625

x=625:25

x=25

d) 42×x=714

x=714:42

x=17

e) 29×x=1363

x=1363:29

x=47

f) 3026:x=34

x=3026:34

x=89