Question

Jeśli X+X×3 wynosi 80 to ile wynosi X?
Jeśli Y×X-X to 130 To ile wynosi Y?
Jeśli Z:Y+X wynosi 500 To ile wynosi Z?​

Answer 1

Odpowiedź:

x + x * 3 = 80

x + 3x = 80

4x = 80

x = 80 : 4 = 20

y * x - x = 130

xy = 130 + x

y = (130 + x)/x

z : y + x = 500 | * y

z + xy = 500y

z = 500y - xy