Решите уровнения 1) (212z-199z)-9=30 2) (410y-395y)+9=84. 3) 1000-(501x+19x)=480. 4)...

Question

Решите уровнения 1) (212z-199z)-9=30 2) (410y-395y)+9=84. 3) 1000-(501x+19x)=480. 4) 999+(602z-582z)=2198

Answer 1

1) (212z-199z)-9=30
13z=30+9
13z=39
z=39/13
z=13

2) (410y-395y)+9=84
15y=84-9
15y=75
y=75/15
y=5

3) 1000-(501x+19x)=480
1000-520x=480
-520x=480-1000
-520x=-520
x=-520/(-520)
x=1

4) 999+(602z-582z)=2198
999+20z=2198
20z=2198-999
20z=1599
z=1599/20
z=79,95

Comments

4) 999+(602z-582z)=2198
999+20z=2198
20z=2198-999
20z=1199
z=1199/20
z=59,95

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1) 3*

Answer 2

(212z-199z)-9=30. (410y-395y)+9=84
13z-9=30. 15y+9=84
13z=30+9. 15y=84-9
13z=39. 15y=75
z=39:13. y=75:15
z=3. y=15