Question

ex 12 va rog dau 30 puncte jur și coroana a) b) c)

Answer 1

12 )

a ) Notez numarul cu ,, a "

a x 5 = 2 x 300

a x 5 = 600

a = 600 : 5

a = 120 → numarul

Verific; 5 x 120 = 2 x 300 = 600

____________________________

b)

3 x 27 = 81 → scazatorul

545 → diferenta

d - 81 = 545

d = 545 + 81

d = 626 → descazutul

Verific: 626 - 81 = 545

_________________________

c)

898 → descazutul

2 x 312 = 624 → diferenta

898 - s = 624

s = 898 - 624

s = 274 → scazatorul

Verific: 898 - 274 = 624

Answer 2

ex 12)

a)
a×5=300×2
a×5=600
a=600:5
a=120

Proba :
120×5=300×2
600=600

b)
b-27×3=545
b-81=545
b=545+81
b=626

Proba :
626-27×3=545
626-81=545
545=545

c)
898-c=312×2
898-c=624
c=898-624
c=274

Proba :
898-274=312×2
624=624