(c-54x19):9+72=720


(45x40+57):dx(9x3+8)=21665


[(f+270:3)x5+100]:600=1


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Răspuns :

Răspuns:

(c-54x19):9+72=720

(c-1026):9=720-72

(c-1026):9=648

c-1026=9×648

c-1026=5832

c=1026+5832

c=6858

(45x40+57):dx(9x3+8)=21665

(1800+57):dx(27+8)=21665

1857:d×35=21665

1857:d=21665:35

1857:d=619

d=1857:619 (d este deîmpărțitul și faci : )

d=3

[(f+270:3)x5+100]:600=1

(f+90)x5+100=1×600

(f+90)x5+100=600

(f+90)x5=600-100

(f+90)x5=500

f+90=500:5

f+90=100

f=100-90

f=10