Question

calculati numărul necunoscut din fiecare relatie:
a) (x+2intregi 8 supra 15)×3 supra 2= 5intregi 1supra 4

b) 2,18:y= 109 supra 1000

Answer 1

a) (x+2intregi 8 supra 15)×3 supra 2= 5intregi 1supra 4
(x+38/15)×3/2= 21/4
x+38/15= 21/4:3/2
x+38/15= 21/4 × 2/3
x+38/15= 7/2
30x+76=105
30x=105-76
30x=29
x=29/30

b) 2,18:y= 109/1000
(218/100):y=109/1000
y=218/100*1000/109
y=20