Question

VA ROG MULT .DAU COROANA REPEDE

Answer 1

3) Fie x numarul 
[tex] \frac{x}{2}-10=40 [/tex]
$\frac{x}{2} =50$
$x=50*2$
$x=100$

4)Fie x numarul

Answer 2

3)a/2-10=40
(A-2x10)/2=(40x2)/2
A-20=80
A=80+20
A=100
Verificare
Jumatate din 100=100/2=50
50-10=40
40=40

4)a-a/2+2=rest=>(2a-a+4)/2=2 rest/2=>a+4=2 rest=>rest =(a+4)/2(1)
Rest-rest/2+3=213(2)
Inlocuim (1) in (2)
(A+4)/2- (a+4)/2x1/2+3=213
(a+4)/2-(a+4)/4+3=213
2(a+4)-a-4+4x3=213x4
2a+8-a-4+12=852
A=852-16
A=836

Verificare
Jumatate din 836=836 /2=418
836-418+2=420
Jumatate din 420=420/2=210
420-210+3=213
210+3=213
213=213 adevărat