Question

exercitiile 17,20,18 va rog mult

Answer 1

ex20
(4500-1800):100+973):100
2700:100+973):100
27+973):100
1000:100=10 
r:10

ex.18
ax10+72=5272
ax10=5272-72
ax10=5200
a=5200:10
a=520
520x10+72=5272
5272=5272

(b+13)x100-4200=5800
(b+13)x100=5800+4200
(b+13)x100=10000
b+13=10000:100
b+13=100
b=100-13
b=87
(87+13)x100-4200=5800
100x100-4200=5800
10000-4200=5800
5800=5800

3290-cx100+460=750
3290-cx100=750-460
3290cx100=290
cx100=3290-290
cx100=3000
c=3000:100
c=30
3290-30x100+460=750
750=750

dx1000:10-210x100=8900
dx100-21000=8900
dx100=8900+21000
dx100=29900
d=29900:100
d=299
299x1000:10-210x100=8900
29900-21000=8900
8900=8900