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Răspuns:

c) (x + 3): 200 = 12

x + 3 = 12 x 200

x = 2400 + 3

d) (x - 23): 15 = 2311 - 1998

x - 23 = 313

x = 313 + 23

e) [2 x (2x + 8)]:16 = 15

2 x(2x + 8) = 15 x 16

2x + 8 = 240 : 2

2x = 120 - 8

2x = 112

x = 56

f) (5126-4835+ x) - 10 = 389

291 + x = 389 + 10

x = 409 - 291

x = 118

g) {[(x + 2): 3] x 4}: 5 - 6 = 6

{[(x + 2) : 3] x 4} : 5 = 6 + 6

[(x + 2): 3] x 4 = 12 x 5

(x + 2) : 3 = 60 : 4

x + 2 = 15

x = 15 - 2 = 13

h) [3 x (3x + 9)]: 13 = 9

3 x (3x + 9) = 9 x 13

3x + 9 = 117 : 3

3x = 39 - 9 = 30

i) [(x + 3): 200 + 90]: 10 - 10 = 0

[(x + 3): 200 + 90]: 10 = 10

(x + 3): 200 + 90 = 10 x 10

(x + 3): 200 = 100 - 90

x + 3 = 10 x 200

x = 2000 - 3

x = 1997

Sper ca te-am ajutat =)

Explicație pas cu pas:

c) (x+3):200=12

×+3/200=12

x+3=2400

x=2400-3

=2397

d) (x-23):15=2311-1998

×-23/15=313

×-23=4695

×=4695+23

×=4718

e) (2×(2x+8)):16=15

(4×+16)=15

4×+16/16=15

4(×+4)/16=15

simplifici fractia cu 4

4(×+4)/16=15

×+4=60

×=60-4

×=56

f) (5126-4835+×)-10=389

(291+×)-10=389

elimini parantezele

291+×-10=389

281+×=389

×=389-281

×=108

g) (((×+2):3)×4):5-6=6

(x+2/3 × 1/4)× 1/5-6=6

x+2/12 × 1/5-6=6

x+2/60-6=6

×+2-360=360

×-358=360

×=360+358

x=718

h) (3×(3x+9)):13=9

(9x+27):13=9

9×+27/13=9

9×+27=117

9×=117-27

9×=90

împărți ecuația cu 9

x=10

i) (( x+3):200+90):10-10=0

(x+3/200+90)×1/10-10=0

×+3+1800/200×1/10-10=0

×+1800/200×1/10-10=0

×+180003/2000-10=0

×+18003-20000=0

×-1997=0

×=1997

sper ca te-am ajutat