Question

Dau coroana! Afla numerele necunoscute. a) (123x-1278):149=36 b) 420:(160-25y)+24 X 7=180 c) {7200-[100-999999: (11000-z)] X 625} :225=7

Answer 1

A)
(123x-1278):149=36
123x-1278=36×149
123x-1278=5 364
123x=5 364+1 278
123x=6 642
x=6 642:123
x=54

B)
420:(160-25 y )+24•7=180
420:(160-25 y )+168=180
420:(160-25 y )=180-168
420:(160-25 y )=12
160-25y=420:12
160-25y=35
25y=160-35
25y=125
y=125:25
y=5

C)
{7200-[100-999999:(11000-z )]•625}:225=7
7200-[100-999999:(11000-z )]•625=7×225
7200-[100-999999:(11000-z )]•625=1 575
[100-999999:(11000-z )]•625=7 200-1 575
[100-999999:(11000-z )]•625=5 625
100-999999:(11000-z )=5 625:625
100-999999:(11000-z )=9
999999:(11000-z )=100-9
999999:(11000-z )=91
11 000-z=999 999 : 91
11 000-z=10 989
z=11 000 - 10 989
z=11

Dacă tu crezi că merit, astept coroana!