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a fost răspuns

Va rog ajutatima si pe mine 2 x X+23=91
327-3 x X=15+48
15+(x+2)+21=47
32+(2 x X-5)=63+14
542+x-117=638
Determinati nr natural necunoscut 19+x<43
28-x>sau egal 11
x+38-18<83

Răspuns :

Miky93
1)327 -3x = 63

-3x = 63 -327

-3x = -264 |:(-3)

x=88

2)36 +x+2=47

38+x=47

x=47-38

x=9

3)32+2x -5= 77

27+2x=77

2x=77-27

2x=50

x=25

4)425 +x=638

x=638-425

x=213

5)  19+x < 43

x < 43-19

x < 24   => x=(1;24)

6)28 -x ≥ 11

-x ≥ 11-28

-x ≥ -17 |-1

x ≤17    => x=(1;17]

7)x+20  < 83

x < 83-20

x < 63   => x=(1;63)

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