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Află pe a din egalitățile:
(120:3+210:7):a-2×5=0
(48-a):2-9:3+5=10
[(a×2-40):(20-18)]×5-16=24
va rog am nevoie urgent....!!!​


Răspuns :

Răspuns:

(40+30):a-10=0

70:a=10 =>a=7

(48-a):2-3+5=10

(48-a):2+2=10

(48-a):2=8

48-a=16 =>a=32

[(a•2-40):2]•5=40

(a•2-40):2=8

a•2-40=16

a•2=56 =>a=28

Răspuns:

(120:3+210:7):a-2×5=0 => (40+30):a-10=0 <=> 70:a-10=0 <=> 70:a=10 => a=7

(48-a):2-9:3+5=10 => (48-a):2-3+5=10 <=> (48-a):2-3=5 <=> (48-a):2=8 <=> (48-a)=16 <=> 48-a=16 => a=32

[(a×2-40):(20-18)]×5-16=24 => [(a×2-40):2]×5-16=24 <=> [(a×2-40):2]×5=40 <=> (a×2-40):2=8 <=> a×2-40=16 <=> a×2=56 => a=28

Coronița?