Question

Determina necunoscuta a : ​

Answer 1

Salutare!

➣Cerința:

• Determina necunoscuta a:

➣Rezolvare:

(81:a+142:2):8=70:7

(81:a+71):8=10

(81:a+71)=10×8

81:a+71=80

81:a=80-71

81:a=9

a=81:9

a=9

(36:(440:4-208:a)=24:4

36:(110-208:a)=6

(110-208:a)=36:6

(110-208:a)=6

208:a=110-6

208:a=104

a=208:104

a=2

55:(198:a+47×2)=88:2

55:(198:a+94)=44

(198:a+94)=55:44

198:a+94=1,25

198:a=1,25-94

198:a=-92,75

a=198:(-92,75)

a=-792/371

48:(155:5-a:2)=12×4

48:(31-a:2)=48

(31-a:2)=48:48

31-a:2=1

a:2=31-1

a:2=30

a=30×2

a=60